Hi @zxd , thank you for posting. Hopefully you can use a translation service to read my response.
It would help us if you could upload your logfile from the output workspace. Please review Guidelines for posting software support questions.
Yes, it is normal for the results to be correct even when you see this error. The error indicates that a text character that was present in the input data (probably some text in the attribute table of the watershed layer) could not be written to the output data when the model tried to make a copy of the watershed layer. It does not affect the model’s calculations.