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The validation rules for entering a value in the Configure Remote Repository textbox are different between Graphite and Mist.
When we created a repo using bitbucket it contained a '-' in the name so, as an example, the following will work in Graphite but not Mist
https://an-example@bitbucket.org/doesnotexist.git
When we created a repo using bitbucket it contained a '-' in the name so, as an example, the following will work in Graphite but not Mist
https://an-example@bitbucket.org/doesnotexist.git