Server error

Hi

I just bought 2 books and trying to open the acsm file Adobe Digital Editions shows me that there is a SERVER ERROR...

Exactly it's said:

    - E_LIC_LICENSE_SIGN_ERROR

And on my ebook, as it is a tagus and it can open the acsm files from inside thanks to the extension, it also sais:

    -E_LSGN_NO_CERTIFICATE

So if you kindly can help me solve this error...

I have the latest version, I also removed the autorisation and it keeps showing the same error...

Thanks