Hi, welcome to the Community :)
That's not an error in Sourcetree, but a limitation from Bitbucket Cloud as you can see at What kind of limits do you have?
To fix it, you need to reduce the size of your local repository to under 2GB and then force push it to your remote, the steps are explained at Reduce repository size.
Let us know if you need any further assistance!
Kind regards,
Ana
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