Picaboo crashes on opening for multiple students

I've used AppInventor over the years in my classroom. With PICaboo, we always run into the same problem. A portion of the students will get it right and another segment of students will have the app crash as soon as it loads to my phone. They are all using the same computers and they are all testing it on an Android of mine. I cannot find a difference in their code. Nor can I grade their work. What is happening?

The most likely thing that is going wrong is that they did not set the WebViewer property of the PersonalImageClassifier component to point to the WebViewer component.

You are right! It's fixed! Thank you.

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