Activation server error on ADE 3.0

Hi!

I unistalled ADE 4.0 and installed 3.0 because 4.0 wouldn't let me open .acsm files or transfer them to other devices. Now, on ADE 3.0, when i try to open an .acsm file, it comes up with a computer autorisaton window which reads "activation server error - code E_ADEPT_INTERNAL"

when i checked both the device and computer authorisation, it says that they are both authorised.

please help!