OPLog: TypeError: Cannot read properties of undefined (reading 'contains')

I am getting this error for javascript course, need help solving this

Hey @jinithakn79,

Sorry about the issue. Do you notice if there is a sale promotion countdown timer showing somewhere on your screen when you run into this problem?

no, i did not get any. When I watch for two hours straight, I encounter this issue. But after logging back in two hours later, it works fine again.

Thanks for the information. It’s a weird behaviour that’s ongoing but seems to appear in different scenarios. Do let me know if it appears again. And if it does, try logging out and back in again like you, I wonder if that fixes it (temporarily).