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iPhone 4s scan crash?

So I'm a substitute teacher who has taken a long-term position for a teacher on maternity leave. She used GradeCam for her classes. I've installed it on my phone and tried testing it -- I can make assignments, set the answer key, etc. But when I go to scan, it says "Accessing scanner" then the whole screen goes to white and DOES NOTHING. I've tried accessing it with the camera closed, with the camera open -- no luck. Gradecam has permission to access the camera in the settings. I'm running iOS 9.3.5. This is supposed to make my life easier and it's turning into a frustration.

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