Texts from particular pages can't be imported

I’ve been getting an error every time, trying to import these pages:

Even the text from these pages can not be imported manually, even though I’ve converted it to simple text (by copy&pasting to Notepad first), so that no formatting could lead to possible problems.

I am getting the “bitarray index out of range” error as I am trying to quick import and error 500 instead of the imported lesson if it try to import manually.

Thanks, it does appear there are still some issues with importing lessons. We are working on these and hope to have them fixed very soon.

@eugrus - We have pushed a number of fixes to importing lessons over the last few days. Are these issues still happening to you?

Thank you! I’ve successfully imported both of these pages now.
I’ll report you if the problem appears again.