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I get the following error, when trying to use the runtime screen editor. (LightSwitch 2011, RTM version)

"The last change wasn't successfully persisted. Please shut down the running application. Error: Object reference not set to an instance of an object."

This happens after making any change and saving. I've tried creating a new project with a single table and a single screen. Same error.

dteske
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    Found the solution. Delete the following directories: %LOCALAPPDATA%\Microsoft\VisualStudio\10.0\ComponentModelCache %LOCALAPPDATA%\Microsoft\VisualStudio\10.0\ManifestCache Found the answer [here](http://social.msdn.microsoft.com/Forums/en-US/lightswitch/thread/99ce68e8-52b1-4bd5-b298-7f9159d18ff7#25097ab9-f828-4cdb-97de-34b5c7aa9d50) – dteske Aug 24 '11 at 16:27
  • You should answer this question below so it can be flagged as answered – Robert MacLean Sep 09 '11 at 19:43

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Found the solution. Delete the following directories: 

%LOCALAPPDATA%\Microsoft\VisualStudio\10.0\ComponentModelCache
%LOCALAPPDATA%\Microsoft\VisualStudio\10.0\ManifestCache

Source here.

dteske
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