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What does "Alert: Error 2314: TypeError: Cannot read property 'length' of null" AND "ScannerPresenter: expected gradecam id." mean?

I've revieved two errors that are not allowing me to scan my students tests. One says "Alert: Error 2314: TypeError: Cannot read property 'length' of null"
the other says "ScannerPresenter: expected gradecam id."

What do these mean and how do I fix them?

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