I can't add my new lesson into the library

I don’t knowe why but already the second day I can’t add my mew Russian article to the livrary.
Again and again I receive the words “There was an error opening this lesson”.
Did someone have such a problem last days?
For example when you import some texts to lingq.
And the question to the adminstration - is it a bug?

Sorry about that Evgueny! I replied on your email and I was also able to reproduce the same issue on some lessons. It’s reported to our team and we will get it fixed asap.