While I solve a problem it turns white with a red box on top saying “null is not a subject”.

Hi AHumanInLife,

I'm not able to reproduce this issue from my end---can you provide a detailed list of steps that you took to arrive at this issue? A link to the relevant page and a screenshot of the issue would also be very helpful.

Thanks!

First, it was okay and I was doing a math question. When I was done with the question, I clicked the check button. It turned white (not the whole screen) and had a red rectangle-box thing, that said something like “Null is not a subject, please refresh if this keep happening, tell us.” When I refreshed, it put me back on my course page. I tried again and re-do the question, it worked for while but the “Null is not a subject” came up again. Then the process keep going on and on.

Thanks for the additional info!

Can you try signing out and signing back in? If that doesn't work, you may need to clear your browser cache.

If you're still persistently experiencing the issue, please submit a support ticket and we'd be happy to further investigate the issue!

Ok thanks