This error is usually your key error and needs to be regenerated.

Open bash in any path of windows, and then enter the command SSH keygen – t RSA – C email address
the default generated key is/C/users/user name/.SSH

View public key

Copy the public key to GitHub
enter the warehouse and click setting -> Deploy Keys -> Add new, paste the public key, enter the key input box, check allow push, and finally click the add key button to submit.