git pull -f

mona@pascal:~/computer_vision/instagram/instagram$ git pull -f
remote: Counting objects: 2, done.
remote: Total 2 (delta 0), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (2/2), done.
From github.com:monajalal/instagram-scraper
   8aa79db..096f325  master     -> origin/master
You asked to pull from the remote '-f', but did not specify
a branch. Because this is not the default configured remote
for your current branch, you must specify a branch on the command line.
mona@pascal:~/computer_vision/instagram/instagram$ git push -u origin master
To git@github.com:monajalal/instagram-scraper.git
 ! [rejected]        master -> master (non-fast-forward)
error: failed to push some refs to 'git@github.com:monajalal/instagram-scraper.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
mona@pascal:~/computer_vision/instagram/instagram$ git pull -f master
fatal: 'master' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.