Hi, 

I'm actually on a project. I have an UML project on Topcased and when I 
validate it I get: 

Message: 
Problems occurred when invoking code from plug-in: 
"org.eclipse.core.resources" 

Exception stack trace: 
java.lang.NullPointerException 
        at 
org.topcased.modeler.editor.Modeler$1$1ResourceDeltaVisitor.<init>(Modeler.java:194)
 

        at 
org.topcased.modeler.editor.Modeler$1.resourceChanged(Modeler.java:219) 
        at 
org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:288)
 

        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) 
        at 
org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:282)
 

        at 
org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:148)
 

        at 
org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:313)
 

        at 
org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1022) 

        at 
org.eclipse.core.internal.resources.Marker.setAttribute(Marker.java:249) 
        at 
org.topcased.validation.core.MarkerUtil.createMarkers(MarkerUtil.java:223) 

        at 
org.topcased.validation.ui.internal.actions.ValidateJob.createMarkers(ValidateJob.java:153)
 

        at 
org.topcased.validation.ui.internal.actions.ValidateJob.handleDiagnostic(ValidateJob.java:130)
 

        at 
org.topcased.validation.ui.internal.actions.ValidateJob.run(ValidateJob.java:75)
 

        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) 

And Topcased says to me "The model is not valid". 
If someone have an idea ... 

Thanks. 
Arnaud
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