I keep getting this when I try to upload new lessons onto my German account. It was happening a couple of days ago too.
@skyblueteapot - Does this only happen to you in German? Is it always for a specific type of lesson?
Just a note: I have been importing a lot of German stuff in the last week and have not had this error.
Well, it’s not happening now so I guess it’s fixed.
For the record, what I was doing was opening epub files in CoolReader and copying and pasting into LingQ, a process which is usually error-free and reasonably idiot-proof.