Netcam Studio does not start

Netcam Studio does not start
Application: NetcamStudioX.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Information: System.InvalidOperationException

So when and why did this happened? Is it a new installation or has it been running before? I assume there is more information than this from the error description.
Anyway, I recommend to do a clean installation as in this guide How to make a clean installation of Netcam Studio