AutoCAD crash and loss of licence

AutoCAD (2002) crashed mid-drawing and a message flashed up something about the licence (too quick to read). Now when I try so start AutoCAD I get the message 'IMPORTANT! In order to continue, you must obtain additional authorization. Error[6]'.
Do I just need to go through the authorization procedure with my existing authorization code? And will it matter that I am using it on a laptop via the portable licence utility (does it need to be re-authorized on the PC that it was originally registered on)? Any help greatly appreciated.

 

You need to fix the license where it is and your old authorization code will
not work as each code is good for one time use only. If you follow prompts
from the error dialog box you describe you will eventually be presented with
a "request code". Contact your dealer or Autodesk customer service with the
request code, serial number and registration information in hand. You will
be issued a "repair code'

--
Jerry Milana,
Autodesk Consulting

about the licence (too quick to read). Now when I try so start AutoCAD I get
the message 'IMPORTANT! In order to continue, you must obtain additional
authorization. Error[6]'.

authorization code? And will it matter that I am using it on a laptop via
the portable licence utility (does it need to be re-authorized on the PC
that it was originally registered on)? Any help greatly appreciated.