I'd contacted with Apple Support because the same error occurred in the other app so I figured it's a system problem, and I was probably right, but still not sure what caused it
So I had only 50gb space left on my SSD, and as a support team suggested, I should free some space and it will solve the problem. I did so and the error did not reoccurred.
But the question is, why is that a thing?
INB4: I had enough room for a video itself.