I replaced my windshield wiper stalk which required removing the damn steering wheel and now have an airbag light.
I had difficulty getting Inpa installed and finally got it running with this error so updated it. After the update I have lost e53. I tried e39 since they are mechanically similar and still get this error:
I saw that meant a port issue (I told it to use USB emulation during install) I found a post on e46 fanatics that directed me to a folder with USB settings.
I changed it as directed with no change.