java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at msi.gama.lang.gaml.ui.editor.GamaSourceViewer$1.process(GamaSourceViewer.java:57)
at msi.gama.lang.gaml.ui.editor.GamaSourceViewer$1.process(GamaSourceViewer.java:1)
at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)
at org.eclipse.xtext.resource.OutdatedStateManager.exec(OutdatedStateManager.java:98)
at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.internalReadOnly(XtextDocument.java:520)
at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:492)
at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:133)
at msi.gama.lang.gaml.ui.editor.GamaSourceViewer.setResourceListener(GamaSourceViewer.java:52)
at msi.gama.lang.gaml.ui.editor.GamlEditor.createPartControl(GamlEditor.java:361)
at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPartControl(CompatibilityPart.java:151)
at org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor.createPartControl(CompatibilityEditor.java:99)
at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create(CompatibilityPart.java:341)

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