The authenticity of the host '' can't be established

I am new to Blender and I have added a new Camera Preset. I have committed the feature. But when I try to pull a request I get this following error:
“The authenticity of host ‘ (’ can’t be established”
Then it prints my rsa fingerprint
Then asks “Are you sure you want to continue?”
If I press yes or no it says “Permission Denied (Public Key)”

How to solve this?
Thank You.

If that refers to GitHub pull request, that will not work. Please use Arcanist and