another-git-process-seems-to-be-running-in-this-repository

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fatal: Unable to create '/home/julyfun/Documents/GitHub/julyfun/PlasticBag/.git/index.lock': File exists.
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Another git process seems to be running in this repository, e.g.
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an editor opened by 'git commit'. Please make sure all processes
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are terminated then try again. If it still fails, a git process
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may have crashed in this repository earlier:
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remove the file manually to continue.