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An unhandled exception of type ‘System.ExecutionEngineException’ occurred in System.Windows.Forms.dll

Cause

It uses an older debugging engine which causes the problem. In other words, it is caused when you compile a 32-bit assembly and try to use it from a 64-bit process.

Solution

Go to Tools > Option > Debugging -> General > un-check the “Use Managed Compatibility Mode”.

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