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Error connecting to undo manager of source file

This error is very confusing and irriritating as it does not give any clear indication about what the problem is. I got this error when I was using Visual Studio 2008 to compile and run a web application. Steps that I followed to overcome this issue were as follows:

(i) I deleted the source file (designer.cs) from the project. But before that, I took a backup of the designer.cs file to be in a safer position.
(ii) Then I right clicked on the ASPX page and select "Covert to Web Application". Finally, I compiled the page and executed it within Visual Studio without the error.

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