Hmm, I had a lot of trouble with this too, but got it working. What sort of PCMCIA card did you get? Or where did you get it?
You are doing things right, the error is telling us possibly a couple things:
1. your network card just isn't working / compatible with the prism2.device.
2. there is something not right with your card slot on the computer.
I had one from AmigaKit, and it never worked for me. Then I tried again with a different card and things went great.
So far you have not even come to any issues with WiFi, cause your driver can't even talk to the network card...