Could not read from remote repository, repository not found

[Toby Rainsford]

Hello,

I have never changed anything on sourcetree or github in the last 2 years settings related. Today I could no longer 'Pull' on sourcetree from my github repo (see image).

I tried generating a new SSH key and adding that to the github account and updating it in sourcetree under Tools > Settings and adding it as the SSH key over the old key. 

I have also pasted the error message below:

git -c diff.mnemonicprefix=false -c core.quotepath=false fetch origin
ERROR: Repository not found.

al: Could not read from remote repository.

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

Completed with errors, see above.

Any urgent help would be greatly appreciated as I need to push some fixes live!

Thanks,

Toby