My TwinCAT PLC project was working fine, but suddenly one day it could not build at all. The error message is simply "The operation could not be completed. Unspecified error".
I also noticed that all my local files, such function block files, would have yellow triangle symbols with an exclamation mark next to them.
If I wanted to start a new project, I would get an exception on _3S.CoDeSys.UserManagement.UserAuthentication.
TwinCAT project build fails with unspecified error
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After a lot of struggle, I finally fixed the problem, sort of.
Apparently, the problem is related to the FipsAlgorithmPolicy register. The register is used to certify cryptographic software. I am not sure whether it is TwinCAT that is not made to comply with that or my PLC project is not up to that standard.
Anyway, to fix the problem:
Type register editor in Windows Start, right click and choose run as an admin.
In register editor, go to HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa.
Under a subkey you should see FipsAlgorithmPolicy. Changed the "enabled" value to 0 or simply delete this register. Restart Visual Studio.