Try updating to a more recent version of the control (the latest official release for Q2 2009 was 2009.2.826) and if you still experience problems, please provide a sample project in a support ticket so we can investigate further.
What I can say for now is that I recall seeing this error in scenarios based on the Grid Editing demo, where when the user clicked a button in the content page, the following actions were executed:
- The RadWindow was closed
- A function in the parent page was called (that function updated the RadGrid control via Ajax).
The problem was that some customers were having DestroyOnClose set to the RadWindow that they were using. What was happening was that p.1 was executed and the window was destroyed and then the browser was trying to execute p.2 from the window that was removed before that.
If this is your case, just switch p.1 and 2 in the logic, i.e. first call the function in the parent page and then close the window - this should clear the error.
If this is not your case, please open a support ticket and send a sample project so I can inspect it closely.
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