After stopping chatGPT-4o I get Error 4001

Hello! I am using chatGPT-4o to help me create a chess variant engine. I have asked requested assistance for a bug. I got it but when reading I have missed a paragraph. I had asked chatGPT-4o to deepen the explanation, but then stopped him as in the meantime I have read the paragraph in question and got satisfied with the previous answer. I got a 4001 error, since then. Thanks for your time.