SQL Express Error – “Failed to generate a user instance of SQL Server”

Having lots of fun with SQL Express tonight, attempting to load another sample I hit another error:

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Microsoft Visual Studio
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Failed to generate a user instance of SQL Server due to a failure in copying database files. The connection will be closed.
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OK  
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In the connection string, I changed it from creating a user instance each time to using a single instance and it appeared to solve my problem.

This is done by modifying the connection string to be “User Instance=False;” instead of “User Instance=True;”