我在安装 Flarum 中，输入命令
git clone firstname.lastname@example.org:flarum/flarum，出错
Cloning into 'flarum'...
Warning: Permanently added the RSA host key for IP address '...' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.