E_ADEPT_DOCUMENT_TYPE_UNKNOWN downloading a book from Google Play Books

Hi!

As suggested by the title, I get an error when I try opening a book I downloaded from Google Play Books with ADE.

This is the error:

(in English it should sound like "Unable to download. License server communication problem: E_ADEPT_DOCUMENT_TYPE_UNKNOWN").

I also tried downloading the book manually from the URL in the .acsm file, but I get another error:

I contacted Google Play assistance but they couldn't help me.

I tried uninstalling and reinstalling ADE, on two different PCs, but it didn't worked.

I downloaded the .acsm file many times, for .epub and .PDF version of the book, but it didn't worked.

I didn't have any problem with books downloaded before and after that one from Google Play Books.

Can someone give me any advice?

Thank you in advance.