When i drag and drop a node with GMF application nothing is drawn and i have this exception org.eclipse.core.commands.ExecutionException: While executing the operation, an exception occurred at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:521) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:206) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:169) at org.eclipse.gmf.runtime.diagram.ui.parts.DiagramCommandStack.execute(DiagramCommandStack.java:156) at org.eclipse.gef.tools.AbstractTool.executeCommand(AbstractTool.java:425) Any help is highly appreciated.
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