Thank you very much for your answer Dr Sassi. I have now simplified my animation, or rather made it differently so that the error in the texture no longer appears.

For the next question I will use a different service to upload a screenshot.

Hello everyone,

I am currently animating a blue ribbon using a spline with sweep + tracer. I am using a fabric material which creates folds. It actually works quite well, but in the render I keep getting a lot of thin, vertical lines, i.e. errors. Can anyone tell me how I can remove these or what the problem is?

https://ibb.co/4d3LQJD

I would be very grateful for your help!
Florian