The specified solution configuration “Debug|MCD” is invalid

Running Microsoft Expression Blend 4 for the first time and creating a hello world application will sometimes gives an error if you try to run it. Error will be something like

“The Specified solution configuration Debug|MCD is invalid” bla bla

Note: Debug|MCD can be replaced by Debug|HPD, Debug|BNB etc..
 

The solution to this problem is weird but it works which is:

Using regedit.exe, navigate to the registry path

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

and selected the key Platform. Platform had the value MCD. (in my case)

Then delete only the value MCD. After this the key Platform was still there but empty,  close Regedit, restarted machine and run Blend 4.

your build for helloworld applicaiton would be successful now

 

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