Hi, just an update. I tried to reset my permissions but in the end doesn't seem to work at all. I'm going to transfer all of my saves to my test user isntead.
EDIT:
I've encountered the smiliar problem when I was trying to transfer files from my usual account to my test account. Before I transferred my files from my usual account, when I double-clicked on my admin test folder, it asked me run as administrator since I've already set the user as an administrator in the first place. Once I finished my transfer, I tried to run the game, but to my surprise, the same error came up! I tried to reset permissions, but the same thing happened as last time, it didn't work.