nullpointer when generating document

1
java.lang.NullPointerException at ie.b(SourceFile:164) at com.mendix.core.Core.execute(SourceFile:187) at dp.execute(SourceFile:183) at jg.a(SourceFile:280) at jg.a(SourceFile:212) at jg.processRequest(SourceFile:168) at fr.a(SourceFile:75) at com.mendix.core.MxRuntime.processRequest(SourceFile:889) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:39) 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$2.run(QueuedThreadPool.java:436) at java.lang.Thread.run(Thread.java:619) Caused by: null at gE.a(SourceFile:151) at fZ.a(SourceFile:74) at jC.a(SourceFile:200) at ko.a(SourceFile:88) at jC.a(SourceFile:200) at df.a(SourceFile:27) at jC.a(SourceFile:200) at jC.c(SourceFile:135) at dI.a(SourceFile:63) at b.a(SourceFile:91) at b.a(SourceFile:62) at cY.a(SourceFile:104) at kH.a(SourceFile:66) at eF.executeAction(SourceFile:96) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:49) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:473) at ie.b(SourceFile:155) at com.mendix.core.Core.execute(SourceFile:187) at dp.execute(SourceFile:183) at jg.a(SourceFile:280) at jg.a(SourceFile:212) at jg.processRequest(SourceFile:168) at fr.a(SourceFile:75) at com.mendix.core.MxRuntime.processRequest(SourceFile:889) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:39) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:113) at org.eclipse.jetty.server.Server.handle(Server.java:334) at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:559) at org.eclipse.jetty.server.HttpConnection$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)
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