I am periodically encountering a "500: Unexpected server error - Module has already been set."
There is the following error included in the log:
ERROR WebPartView : renderView() exception in org.labkey.api.view.template.DialogTemplate while responding to /login/home/login.view?
Unfortunately, this error means a restart is necessary to get things up and running again.

Appears to be tied to the renderView() within WebPartView on login...maybe? It seems to happen independently of deployments, sometimes follows maintenance, but the errors aren't reproducible pattern and don't necessarily appear tied to user events. For example, logging in may display a visible error, but this one happened at 2:15am when no logins occurred (according to the audit).

Curious if anyone else has experienced similar and/or has any ideas. I saw this thread: https://www.labkey.org/home/Support/Server%20Forum/announcements-thread.view?rowId=13871, but it didn't lead me anywhere.

Thanks!

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The stack trace for the most recent event is:
ERROR ExceptionUtil
java.lang.IllegalStateException: Module has already been set.
    at org.labkey.api.view.BaseWebPartFactory.setModule(BaseWebPartFactory.java:177)
    at org.labkey.api.module.DefaultModule.getWebPartFactories(DefaultModule.java:414)
    at org.labkey.api.view.Portal.initMaps(Portal.java:1129)
    at org.labkey.api.view.Portal.getViewMap(Portal.java:1117)
    at org.labkey.api.view.Portal.getPortalPart(Portal.java:1105)
    at org.labkey.api.module.SimpleFolderType.createWebParts(SimpleFolderType.java:269)
    at org.labkey.api.view.SimpleFolderTab.<init>(SimpleFolderTab.java:98)
    at org.labkey.api.module.SimpleFolderType.createFolderTabs(SimpleFolderType.java:216)
    at org.labkey.api.module.SimpleFolderType.<init>(SimpleFolderType.java:108)
    at org.labkey.api.module.SimpleFolderType.create(SimpleFolderType.java:153)
    at org.labkey.api.module.FolderTypeManager$SimpleFolderTypeCacheHandler$1.load(FolderTypeManager.java:277)
    at org.labkey.api.module.FolderTypeManager$SimpleFolderTypeCacheHandler$1.load(FolderTypeManager.java:267)
    at org.labkey.api.cache.BlockingCache.get(BlockingCache.java:144)
    at org.labkey.api.module.ModuleResourceCache.getResource(ModuleResourceCache.java:66)
    at org.labkey.api.module.ModuleResourceCache.getResources(ModuleResourceCache.java:95)
    at org.labkey.api.module.FolderTypeManager.getSimpleFolderTypes(FolderTypeManager.java:240)
    at org.labkey.api.module.FolderTypeManager.ensureAllFolderTypes(FolderTypeManager.java:128)
    at org.labkey.api.module.FolderTypeManager.getFolderType(FolderTypeManager.java:148)
    at org.labkey.api.data.ContainerManager.getFolderType(ContainerManager.java:473)
    at org.labkey.api.data.Container.getFolderType(Container.java:795)
    at org.labkey.api.data.Container.getActiveModules(Container.java:1010)
    at org.labkey.api.data.Container.getActiveModules(Container.java:910)
    at org.labkey.api.util.PageFlowUtil.getModuleClientContext(PageFlowUtil.java:2538)
    at org.labkey.api.util.PageFlowUtil.jsInitObject(PageFlowUtil.java:1978)
    at org.labkey.api.util.PageFlowUtil.getLabkeyJS(PageFlowUtil.java:1812)
    at org.labkey.api.util.PageFlowUtil.getIncludes(PageFlowUtil.java:1594)
    at org.labkey.api.util.PageFlowUtil.getStandardIncludes(PageFlowUtil.java:1536)
    at org.labkey.api.util.PageFlowUtil.getStandardIncludes(PageFlowUtil.java:1515)
    at org.labkey.jsp.compiled.org.labkey.api.view.template.dialogTemplate_jsp._jspService(dialogTemplate_jsp.java:163)
    at org.labkey.api.view.JspView.renderView(JspView.java:168)
    at org.labkey.api.view.WebPartView.renderInternal(WebPartView.java:370)
    at org.labkey.api.view.HttpView.render(HttpView.java:136)
    at org.labkey.api.view.HttpView.render(HttpView.java:121)
    at org.labkey.api.action.SpringActionController.renderInTemplate(SpringActionController.java:522)
    at org.labkey.api.action.SpringActionController.handleRequest(SpringActionController.java:417)
    at org.labkey.api.module.DefaultModule.dispatch(DefaultModule.java:1281)
    at org.labkey.api.view.ViewServlet._service(ViewServlet.java:190)
    at org.labkey.api.view.ViewServlet.service(ViewServlet.java:124)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.labkey.api.data.TransactionFilter.doFilter(TransactionFilter.java:38)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.labkey.core.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:118)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.labkey.api.module.ModuleLoader.doFilter(ModuleLoader.java:1144)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.labkey.api.security.AuthFilter.doFilter(AuthFilter.java:205)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:958)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
    at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:190)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)