Error : E_GOOGLE_DEVICE_LIMIT_REACHED

Hello !

I'm italian so i'm sorry for my bad english

One year ago i downloaded from google play some books , next i trasferred them on a ebook reader . For a mistake i delet all the books , now i want to download them again , but when i try to open the acsm file that i downloaded from google , a error message appears (E_GOOGLE_DEVICE_LIMIT_REACHED)

what can i do ?

THANKS TO ALL !