E_ADEPT_DOCUMENT_TOO_SHORT

Hi,

I bought several books and when I want to transfer them on ADE an error message appears: "error during the obtaining of the license. Communications problems with the waiter of license. E_ADEPT_DOCUMENT_TOO_SHORT"

Moreover, this message also appears during transfer of books which worked before.

So, it's a problem of ADE. How then I solve it?

Help me please

Thank you very much