“Runtime error Exception has been thrown by the target of an invocation” from Script task

Question

I have a SSIS package with a script task, I get the following error when i try to run it in my local system. It works fine for my collegues as well as in production. However

Answer 1

In my case it was missing DLLs or not having the correct version installed on the server.

Locally all tests were fine but on the server the error message Runtime error Exception has been thrown by the target of an invocation kept popping up.

No exception handler would be able to catch that error - the code in the script task would not even be executed, as soon as a DLL would be needed, that is not in the assembly cache on the server (it could happen on a local machine as well, with the same error).

The difficulty here is finding out what is missing and then either update the references to the correct version or install the missing DLL in the assembly cache with gacutil. The way I approached the debugging was to remove parts of the code in the script task until that error wouldn't appear, then analyze the missing part for references.