I was able to fetch, pull, clone and push since I started to use Sourcetree and git. But then this error appears out of sudden when I'm trying to fetch or pull, and I cannot do anything about it.
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git -c diff.mnemonicprefix=false -c core.quotepath=false fetch origin
ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no: ssh: command not found
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
Completed with errors, see above.