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I believe I may have fixed my issue and I'll update this answer if it is not the case. By moving my python projects to a new folder the error disappears, I don't know whether there were temporary files or something that caused the issue but it appears to be gone.

I am still unsure about what has caused this problem and it seemed to appear for even extremely simple cases with 3 bus networks with no user model data, indicating that it wasn't an issue with the *.dll files I was using which I initially suspected.

I believe I may have fixed my issue and I'll update this answer if it is not the case. By moving my python projects to a new folder the error disappears, I don't know whether there were temporary files or something that caused the issue but it appears to be gone.gone.

I am still unsure about what has caused this problem think I have narrowed it down to a DSUSR.DLL model file. Apparently PSS/E automatically searches the directory for these user generated models and it seemed to appear for even extremely simple includes them automatically despite me not declaring them in my script, I had multiple cases with 3 bus networks with no user model data, indicating that it wasn't an issue with the *.dll files in one folder while I was using which I initially suspected.testing my code and hence my code only worked for one case, the one that this file belonged to.

I believe I may have fixed my issue found the problem and I'll update solution if anyone else comes across this answer if it is not the case. issue.

By moving my python projects to a new folder the error disappears, disappeared, I don't know whether there were temporary found that it was occurring due to an extra DSUSR.DLL file that belonged to a different case file. When you load up a case file, PSS/E attempts to include all user created dll files or something that caused with this and similar names and includes them automatically in the issue but it appears project. In some cases, the user models have the ability to be gone. stop and prevent the process running.

I think I have narrowed it down to a DSUSR.DLL model file. Apparently PSS/E automatically searches the directory for these user generated models and includes them automatically despite me not declaring them in my script, I had multiple cases in one folder while Since I was testing my code scripts against different known data sets, I had several case files and hence my code only worked for one case, their models in the one directory. The script was working on the case that this the dll file belonged to.to but no other cases, even extremely simple 3 bus cases with no user models. By changing my script to a new directory or deleting the unused dll files, the error disappeared. I could also recreate the error by introducing that dll file back in the directory.