I am getting this error when trying to upload ebook.
Why does not LingQ just split the problematic word and warn the user? Preventing upload is bit harsh. Anyway how do I look for the long word(s) in my ebook (epub) and delete it/split it manually?
I have issues with uploading Harry Potter’s third book both in French and German. Strangely the other books were uploaded just fine.
Strange, there must be something wrong with your epub file. Maybe you can try to convert it to other format (PDF?) and try again?
Strange as it may sound your solution actually worked and pdfs were imported without an issue. Thank you!
Perfect! 
I am having the same problem and didn’t help converting it into pdf or mobi
I’m having the same problem, in my case their indeed was a very (!) long word.
I tried to upload “Ulysses” from James Joyce and in the credits there is a guy with this amazing title:
“Nationalgymnasiummuseumsanatoriumandsuspensoriumsordinaryprivatdocentgeneralhistoryspecialprofessordoctor”
I converted the ebook to txt to eliminate it, then I could upload it.
However I think you should find a way to get along with, especially in german there are some veeeeery long words, e.g. RindfleischetikettierungsĂĽberwachungsaufgabenĂĽbertragungsgesetzesentwurfsdebattierklubdiskussions-standsberichterstattungsgeldantragsformular
Kind regards
W*
Ahh cool. I will try to do that and see if it helps. Always wondered what the long word could be, as I don’t read the ebook beside through LingQ.
Thanks for pointing that out and happy reading