Fix typo in exception message when attempting to open a repo

[ppejovic]

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
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[dustin-decker]

Thank you for the contribution, Pero. We'll need you to sign the CLA before we can accept this.

[bill-rich]

I'm going to close this PR because this has been fixed elsewhere.