Time to update to 1.1.2+
Versions of Rhyno older than 1.1.1 won't work after 15th of February, 2021.
On the 15th, PTV made a significant change that impacts older versions of Rhyno. The good news is, Rhyno is free and so is the update which resolves this issue.
Head on over to the App Store and install the latest version, and you'll be golden.