I had a model that did the exact. same. thing. except with a different thing, Because I am lazy; I was using a free model loading screen. (It looked AMAZING!) But when I played 4 or more times, it gave me a VERY VERY REAL looking error and said to add something that was by them from the toolbox.
But I wasn’t stupid I deleted it and the error stopped, it looked hyper-realistic like it was a real Roblox error.