Please Help - Failed Smog Test
 

I took my 97 Accent GT in to get it smog tested today.
The guy said it passed emissions fine, but failed due to some
electronic thing that he hooked up on the front left dashboard. Said
it would not communicate with the car properly.

It says on my report:
FAILED DUE TO OBD2 Communication problem
recommend diagnosis $65.

On the official VIR it says :
"FAIL System Malfunction Light"

"vehicle failed the MIL/Check Engine Light due to OBD communications
failure"

Everything else is either a PASS or a NOT APPL.

What does this failure mean? (the check engine light was NOT on, so I
don't know what the above "system malfunction light" refers to)

What is the best way to proceed? What should I expect to pay for
fixing this? Is it something I need a dealer repair place to fix, or
can any good mechanic trace it down and fix it?

Any input from you experts would be appreciated!
Thanks!