Adobe Digital editions

I need some help. I just bought a book online and it's in ACSM format. Then I downloaded Adobe Digital editions but for the first time loading the book, I didn't relate it to my ID. Then I realized that I actually have an ID, so I logged in my ID but the book is impossible to load anymore. It says that I need autorization to read it. If I redrop the book, it says  E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER. But the first time I load it, I didn't relate it to any ID so I have no idea how to load the book anymore. 

I'm eager to know how to solve this!