i cant open my ebook! in ádobe digital editions

i cant open my ebook in adobe digital editions
it says 

Unable to download

Error getting License. License Server Communication Problem:

E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER

so i turned to the online store i bought the book from. And they gave me a new ACSM file. But still i get the same error message.

Unable to download

Error getting License. License Server Communication Problem:

E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER

i dont think i have authorization code or something like that.
i dont remember it was a long time ago.
i dont know what to do.