An unhandled exception of type protoapp.e

Hi guys,
I am trying to build a graph using the evalution run.When i try to run ProtoApp Project it throws exception like
“An unhandled exception of type ‘System.NullReferenceException’ occurred in ProtoApp.exe
Additional information: Object reference not set to an instance of an object.”
protected void fileNewMenuItem_Click(Object sender, EventArgs evt) {
GraphViewWindow canvas = new GraphViewWindow();
canvas.MdiParent = this;
The Debugger stops in the canvas.View.UpdateInfo line.
what could be the problem.Please help me guys.

Jai jai

Maybe that’s a bug in the sample application. But I am unable to reproduce the problem. Can you describe your machine and run-time environment? Are you running the ProtoApp.exe that we installed as part of GoDiagram Win version 2.3.1, or are you using a different version, or have you modified the sample application?