internal error, white screen on testing

I'm getting a white screen with a "internal error" text when running app tests in the browser, with or without frame, but not in the Tester app on my phone. I have cleared my browser cache, tried with a different browser, tried with a different computer, commented out the code I was working with since I did a last working test. The only thing currently working is reverting to a previous version. Any ideas on what it is and what to do?

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