I am facing below mentioned error during server startUp Request action: start Message: Starting MxRuntime failed. Cause: This user name is already in use. Stack trace: com.mendix.m2ee.api.AdminException: Starting MxRuntime failed. at com.mendix.core.MxRuntime.B(SourceFile:255) Caused by: com.mendix.systemwideinterfaces.core.DataValidationRuntimeException: This user name is already in use. at ia.a(SourceFile:201) at ig.setValue(SourceFile:243) at com.mendix.core.objectmanagement.member.MendixString.setValue(SourceFile:64) at com.mendix.core.objectmanagement.member.MendixString.setValue(SourceFile:11) at ig.parseValueFromString(SourceFile:263) at ig.parseValueFromString(SourceFile:258) at if.setValue(SourceFile:265) at kk.e(SourceFile:391) at kk.a(SourceFile:64) at com.mendix.core.MxRuntime.C(SourceFile:290) at com.mendix.core.MxRuntime.B(SourceFile:245) at com.mendix.core.MxRuntime.a(SourceFile:227) at com.mendix.core.MxRuntime.b(SourceFile:178) at fP.a(SourceFile:50) at fO.execute(SourceFile:26) at com.mendix.m2ee.server.handler.HttpAdminHandler.handle(HttpAdminHandler.java:121) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111) at org.eclipse.jetty.server.Server.handle(Server.java:351) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:642) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:609) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:45) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:599) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:534) at java.lang.Thread.run(Thread.java:662) Can anyone throw some light on this?