NullReferenceException when using a Library

I created a custom library to use but when i use this library in another process i keep getting the ‘Object reference not set to an instance of an object’ error. I checked the variables and they are all not empty. When i invoke the same workflow into the script it seems to work fine. So the issue is only when applying the library. Has someone encountered this before?


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Also, the logs only mention starting the sequence. It seems that the error pops up before any activity is started in the workflow.

Did you ever find a solution to this? I’ve created libraries before and not had any problems. Today I created a new one and am getting this same error for no apparent reason. The library code itself runs fine, but when I add the custom activity to another project I get this error.