I can't add a GPG key to GitHub

GitHub always say:

> “We have an error doing that.”

everytime when I tried to add my GPG key to my GitHub account.

I use the following command to export my GPG public key:

gpg --armor --export 366F5C85A6F6A904

This error is my problem or GitHub’s?

Unfortunately, we don’t have access to private account details here. You’ll need to contact private support at https://github.com/contact or via email at support@github.com.

Let us know if you have more questions.