Mac OS still suffers from convulsions. It was used fine one minute ago, and an unknown error occurred in the signature of the real machine test the next minute. Then goose, what you don’t expect is that you just need to restart the computer. I don't know what to do.
Of course, when xcode gets windy, it may also report an error Run custom shell script '[cp] embed pods frameworks', you don't need to worry about these, and it will be fine after restarting the computer.