I can't open pokemon insurgence

So around 2-3 weeks ago I got onto my computer to play some insurgence. I opened the file and clicked game. The screen was completely dark for a few seconds then a bunch of messages appeared {TypeError, "incompatible marshal file format (can’t be read) and a bunch of other stuff i didn’t understand, do any of you know how to fix this?

https://forums.p-insurgence.com/t/end-of-file-reached/18551/2

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I think i understand what i have to do, its just i have literally no idea where the save file is, ive looked all over the place and when it never makes any sense to me how you guys explain it

EDIT: nvm i finally was able to save my file. thanks Deukhoofd