Problem opening certain lessons

I can’t open certain lessons. The error message is: “There was an error opening this lesson. We have been notified and will investigate this issue. You will be redirected to the home page where you can try opening another lesson.” It seems to only affect the LingQ News Feed lessons and I can open other lessons. It has been going on for a few days now. How do I fix this?

I reported the issue to our team and we will have it fixed soon. The problem is that after importing some lessons are added as an empty lesson, and that is why you see an error message when you try to open them.
Sorry about that.

This has been plaguing me as well with random lessons refusing to open from imported content.