Hi @Mohammed Amer,
Welcome to Atlassian Community.
The error you get indicate that your local copy of the master branch is behind the remote master. In order to resolve that you first have to do a pull, and once that is done the push should work.
Hey @Mikael Sandberg , thanks for quick reply. I have already tried to pull but the pull button is greyed out and I was unable to proceed.
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Try and do the pull from the command line. In Sourcetree, click on Terminal and from here run:
git pull
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