aRFR "encountered a fatal error and cannot continue"

Hi folks, I'm having some trouble with the aRFR app. When I try to open it, I get a message saying "Your application has encountered a fatal error and cannot continue". The app version is 4.1.1, installed on a Samsung Galaxy Tab E 8.0 (model number SM-T377V), with Android version 7.1.1.

I have tried restarting the tablet. I have tried clearing the aRFR cache and data. I have tried uninstalling and reinstalling the app. None of these have worked so far. Is there something else I can try? The app has previously worked on this tablet, and today was the first time I have encountered this error. Has anyone else run into this before?

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