I'm now having issues with the new License Pool Manager module on my development machine using the built-in database: java.lang.IllegalArgumentException: Invalid UUID string: undefined at java.util.UUID.fromString(UUID.java:204) at com.mendix.externalinterface.connector.RequestHandler.getSessionFromRequest(SourceFile:53) at ju.a(SourceFile:218) at ju.processRequest(SourceFile:174) at fC.a(SourceFile:71) at com.mendix.core.MxRuntime.processRequest(SourceFile:916) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:42) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113) at org.eclipse.jetty.server.Server.handle(Server.java:334) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559) at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1007) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:747) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:209) at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436) at java.lang.Thread.run(Thread.java:619) This error occurs as soon as the browser connects and the login screen appears. If you try to log in a message 'Sign in failed' appears on the login screen, and a similar error is recorded in the Modeler console: An error has occurred while handling the request. com.mendix.core.CoreException: Exception occurred in action '[LoginAction:: user=dsanders]', all database changes executed by this action were rolled back at com.mendix.core.actionmanagement.CoreAction.d(SourceFile:553) Caused by: java.lang.IllegalArgumentException: Invalid UUID string: undefined at java.util.UUID.fromString(UUID.java:204) at av.c(SourceFile:80) at av.a(SourceFile:52) at com.mendix.core.action.user.LoginAction.a(SourceFile:87) at com.mendix.core.action.user.LoginAction.a(SourceFile:59) at com.mendix.core.action.user.LoginAction.executeAction(SourceFile:15) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:49) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:473) at it.b(SourceFile:155) at com.mendix.core.Core.login(SourceFile:1703) at com.mendix.core.Core.login(SourceFile:1738) at bt.execute(SourceFile:58) at ju.a(SourceFile:259) at ju.a(SourceFile:205) at ju.processRequest(SourceFile:174) at fC.a(SourceFile:71) at com.mendix.core.MxRuntime.processRequest(SourceFile:916) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:42) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113) at org.eclipse.jetty.server.Server.handle(Server.java:334) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559) at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1007) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:747) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:209) at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:406) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:462) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:436) at java.lang.Thread.run(Thread.java:619)