git pull error when trying to deploy to AWS EC2

I am trying to commit some new lines of code from my repository to Aws. I have everything synced on Github. Trying to do a pull from my repository to the EC2 instance.

I ssh in to my EC2, no issues here, but when I do "git pull" (and enter in my github username and password) i get a prompt saying:

"You are not currently on a branch. Please specify which branch you want to merge with. See git-pull(1) for details. git pull <remote> <branch>".

Appreciate your help!