Problems after repo upgrade in Android source code

In the morning on the computer to synchronize the android source code (using repo sync), the prompt "a new version of Repo is available", so downloaded the latest repo (curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo> repo)

Execute repo again with the same prompt. Take a closer look at the following several lines

Error: cannot run GPG: no such file or directory
Error: cocould not run GPG.
Error: cocould not verify the tag 'v1. 12.0'

It turns out that this is root cause (the repo can be upgraded by itself). The MAC of the cup does not have the GPG command.

Google found the GPG (https://www.gpgtools.org/) under the Mac, and then re-executed repo sync after the installation was complete again with a new error

GPG: Can't check Signature: No public key
Error: cocould not verify the tag 'v1. 12.0'

Help Google find the answer again

"The error occurred because I used repo sync to sync code from other libraries and delete ~ /. Repoconfig"