E_ADEPT_DOCUMENT_TYPE_UNKNOWN:

Hi I have recently upgraded Mac and installed ADE 4.5 (I had to re do password etc) however old library comes up but I can't import new books (from KOBO an ACSCM file) it gives me this error -  Error getting License. License Server Communication Problem:

E_ADEPT_DOCUMENT_TYPE_UNKNOWN:

Have tried everything re installing, de activation and activating but nothing - Kobo don't know, Adobe refer me to forum and there is nothing on there that resolves the issue. Can anybody help with this?