Very sorry for the inconvenience!
Regarding the Toolbox Configurator - Can you please verify that the Visual Studio extensions are the correct version? (You can go to Visual Studio | Tools | Extension Manager
and verify the version is 2012.1.214.0 ). If they are not you can try updating and trying the configurator again.
Regarding the run error - Have you tried cleaning and rebuilding the solution? Make sure that you run the Visual Studio as administrator as this could cause the issue as well.
I hope we resolve the issue soon.
All the best,
the Telerik team
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