Entity Framework cannot update database

Question

My application crashes with the following error whenever I save to the DB.

Unable to find an entry point named \'SetClrFeatureSwitchMap\' in DLL \'Sql

Answer 1

From my experience with this error, this happens only with Entity Framework 5 targeting .NET 4 (as opposed to .NET 4.5) when using a SQL Server with SQL Server Service Pack 3. More info on possible root cause here. Solutions that worked for me:
1) KdBoer's fix, or
2) Update the application to Entity Framework 6