codesign "The operation was cancelled by the user"

For some reason, whenever I try to codesign in xcode, I am getting this error

(path to app开发者_Python百科): The operation was cancelled by the user. Command /usr/bin/codesign failed with exit code 1

I had this error after I changed my login keychain password, and my developer certificate was in this keychain.

I restarted and unlocked the keychain again and all was well.

I spent hours trying to figure out why I was getting "The operation was cancelled by the user. Command /usr/bin/codesign failed with exit code 1".

I tried locking and unlocking all my keys (be sure you know the password first) and it fixed the problem.

Thanks to the contributors above for this advice.

For some reason, I restarted my computer and the error went away.