--- title: "Internal server error when starting Calc" url: "https://openforis.support/questions/3164/internal-server-error-when-starting-calc" tags: ["calc"] status: "answered" score: 0 answer_count: 3 asked: "2021-06-11T15:17:40" last_activity: "2021-08-16T10:12:58" source: "Open Foris Support - Q&A Forum" license: "Copyright Open Foris, 2026. Some rights reserved under creative commons license." --- # Internal server error when starting Calc Asked by Jeremiah on 2021-06-11 Hi OFCteam. I have smoothly been using Calc for a couple of weeks. Suddenly, now Calc unsuccessfully opens with an internal server error "The server encountered an internal error that prevented it from fulfilling this request" I have tried un-installing & re-installing JDK, Postgres, R, RStudio and Calc to no avail. Any help please. Thanks, Jeremiah. ## Answer (score 0, by Stefano (OF) on 2021-06-11) Link: https://openforis.support/questions/3164/internal-server-error-when-starting-calc/3165 Dear Jeremiah, Can you please share with us the content of the log files? We will contact you to your private email to better understand your problem. Many thanks, Open Foris Team ## Answer (score 0, by jpdash on 2021-08-10) Link: https://openforis.support/questions/3164/internal-server-error-when-starting-calc/3210 Hi OF Team, I am now experiencing the same issue noted by Jeremiah when trying to install OF Calc on a new laptop using Windows 10 64 bit OS. The laptop has JDK 1.8, PostgreSQL 9.4, both and R and R Studio are configured using the instructions in the user manual. This is the same configuration I have on another laptop where Calc is working fine. The log file is pasted below as I don't seem to be able to attach it. Could you please help me to troubleshoot this instalation issue. Many thanks, Jonathan Aug 10, 2021 11:50:52 AM org.apache.catalina.core.AprLifecycleListener init INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.8.0_301\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Users\NFI_1\AppData\Local\Microsoft\WindowsApps;;. Aug 10, 2021 11:50:53 AM org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["http-bio-8081"] Aug 10, 2021 11:50:53 AM org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["ajp-bio-8010"] Aug 10, 2021 11:50:53 AM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 605 ms Aug 10, 2021 11:50:53 AM org.apache.catalina.core.StandardService startInternal INFO: Starting service Catalina Aug 10, 2021 11:50:53 AM org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet Engine: Apache Tomcat/7.0.47 Aug 10, 2021 11:50:53 AM org.apache.catalina.startup.HostConfig deployDescriptor INFO: Deploying configuration descriptor C:\opt\OpenForisCalc\calc-server\tomcat\conf\Catalina\localhost\calc.xml Aug 10, 2021 11:50:55 AM org.apache.catalina.startup.ContextConfig processAnnotationsJar SEVERE: Unable to process Jar entry [module-info.class] from Jar [jar:file:/C:/opt/OpenForisCalc/calc-server/tomcat/webapps/calc/WEB-INF/lib/gson-2.8.6.jar!/] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:133) at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:60) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2134) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2010) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1976) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1961) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1319) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:663) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1642) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Aug 10, 2021 11:50:55 AM org.apache.catalina.startup.ContextConfig processAnnotationsJar SEVERE: Unable to process Jar entry [module-info.class] from Jar [jar:file:/C:/opt/OpenForisCalc/calc-server/tomcat/webapps/calc/WEB-INF/lib/jackson-databind-2.12.1.jar!/] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:133) at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:60) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2134) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2010) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1976) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1961) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1319) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:663) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1642) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Aug 10, 2021 11:50:57 AM org.apache.catalina.startup.ContextConfig processAnnotationsJar SEVERE: Unable to process Jar entry [module-info.class] from Jar [jar:file:/C:/opt/OpenForisCalc/calc-server/tomcat/webapps/calc/WEB-INF/lib/jackson-core-2.12.1.jar!/] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:133) at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:60) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2134) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2010) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1976) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1961) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1319) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:663) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1642) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Aug 10, 2021 11:50:58 AM org.apache.catalina.startup.ContextConfig processAnnotationsJar SEVERE: Unable to process Jar entry [module-info.class] from Jar [jar:file:/C:/opt/OpenForisCalc/calc-server/tomcat/webapps/calc/WEB-INF/lib/xmlpull-1.2.0.jar!/] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:133) at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:60) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2134) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2010) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1976) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1961) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1319) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:663) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1642) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Aug 10, 2021 11:50:58 AM org.apache.catalina.startup.ContextConfig processAnnotationsJar SEVERE: Unable to process Jar entry [module-info.class] from Jar [jar:file:/C:/opt/OpenForisCalc/calc-server/tomcat/webapps/calc/WEB-INF/lib/jackson-annotations-2.12.1.jar!/] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:133) at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:60) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2134) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2010) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1976) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1961) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1319) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:663) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1642) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Aug 10, 2021 11:51:00 AM org.apache.catalina.startup.ContextConfig processAnnotationsJar SEVERE: Unable to process Jar entry [META-INF/versions/9/module-info.class] from Jar [jar:file:/C:/opt/OpenForisCalc/calc-server/tomcat/webapps/calc/WEB-INF/lib/log4j-api-2.13.3.jar!/] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:133) at org.apache.tomcat.util.bcel.classfile.ConstantPool.(ConstantPool.java:60) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:209) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:119) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2134) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:2010) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1976) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1961) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1319) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:663) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1642) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) Aug 10, 2021 11:51:03 AM org.apache.catalina.util.SessionIdGenerator createSecureRandom INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [391] milliseconds. Aug 10, 2021 11:51:08 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\opt\OpenForisCalc\calc-server\tomcat\webapps\host-manager Aug 10, 2021 11:51:09 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\opt\OpenForisCalc\calc-server\tomcat\webapps\manager Aug 10, 2021 11:51:09 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\opt\OpenForisCalc\calc-server\tomcat\webapps\saiku Aug 10, 2021 11:51:16 AM com.sun.jersey.api.core.PackagesResourceConfig init INFO: Scanning for root resource and provider classes in the packages: org.saiku.web Aug 10, 2021 11:51:16 AM com.sun.jersey.api.core.ScanningResourceConfig logClasses INFO: Root resource classes found: class org.saiku.web.rest.resources.QueryResource class org.saiku.web.rest.resources.SessionResource class org.saiku.web.rest.resources.DataSourceResource class org.saiku.web.rest.resources.ExporterResource class org.saiku.web.rest.resources.BasicTagRepositoryResource class org.saiku.web.rest.resources.StatisticsResource class org.saiku.web.rest.resources.BasicRepositoryResource class org.saiku.web.rest.resources.BasicRepositoryResource2 class org.saiku.web.rest.resources.OlapDiscoverResource Aug 10, 2021 11:51:16 AM com.sun.jersey.api.core.ScanningResourceConfig init INFO: No provider classes found. Aug 10, 2021 11:51:16 AM org.codehaus.enunciate.modules.jersey.EnunciateJerseyServletContainer configure INFO: org.codehaus.enunciate.modules.amf.JAXRSProvider not found. Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, datasourceResourceBean, of type org.saiku.web.rest.resources.DataSourceResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, olapDiscoverBean, of type org.saiku.web.rest.resources.OlapDiscoverResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, queryResource, of type org.saiku.web.rest.resources.QueryResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, sessionResource, of type org.saiku.web.rest.resources.SessionResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, repositoryBean, of type org.saiku.web.rest.resources.BasicRepositoryResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, repository2bean, of type org.saiku.web.rest.resources.BasicRepositoryResource2 as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, tagRepositoryBean, of type org.saiku.web.rest.resources.BasicTagRepositoryResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, exporterBean, of type org.saiku.web.rest.resources.ExporterResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.spi.spring.container.SpringComponentProviderFactory registerSpringBeans INFO: Registering Spring bean, statsBean, of type org.saiku.web.rest.resources.StatisticsResource as a root resource class Aug 10, 2021 11:51:16 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate INFO: Initiating Jersey application, version 'Jersey: 1.11 12/09/2011 10:27 AM' Aug 10, 2021 11:51:17 AM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\opt\OpenForisCalc\calc-server\tomcat\webapps\saiku-ui Aug 10, 2021 11:51:17 AM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-bio-8081"] Aug 10, 2021 11:51:17 AM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["ajp-bio-8010"] Aug 10, 2021 11:51:17 AM org.apache.catalina.startup.Catalina start INFO: Server startup in 24530 ms ## Answer (score 0, by Lauri (OF) on 2021-08-16) Link: https://openforis.support/questions/3164/internal-server-error-when-starting-calc/3211 Dear Jonathan, programmers seem to be on leave. Meanwhile, we will contact you from FAO to your private email to better understand your problem. regards, Lauri (Open Foris Team)