A project which worked OK in 2.5 is now giving me the following error when I try to upload a file: com.mendix.systemwideinterfaces.MendixRuntimeException: File document for file id 1 could not be retrieved at iv.b(SourceFile:285) at iv.a(SourceFile:150) at iv.a(SourceFile:102) at iv.a(SourceFile:79) at iv.processRequest(SourceFile:72) at ix.a(SourceFile:71) at com.mendix.core.MxRuntime.processRequest(SourceFile:850) at com.mendix.m2ee.server.handler.RuntimeHandler.handle(RuntimeHandler.java:43) 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) Can anybody interpret please?