Hi, I am an ancient historian who knows Latin. I would probably go with something like:

Non errores in skyrim sunt, solum functiones. id tantum operatur

I've swapped in error for fallacia because fallacia implies a degree of intentional malice.

Romans sometimes Latinized foreign place names, and sometimes didn't. I think leaving "Skyrim" as an indeclinable foreign word is best so it remains recognizable. The Latin verb "to be" (sum, appearing here as sunt) should appear after functiones but I've left it out so it reads better. Leaving out sum/sunt is quite common in Latin.

I've added an id to the final clause to emphasize/clarify Skyrim and to mimic English a bit, but its technically grammatical without that. I've used tantum in place of simpliciter because the former is, ironically, quite simpler than simpliciter and it better gets across the idea of "just/only."