What does "Net: Invalid VerifierType" mean?

What does "Net: Invalid VerifierType" mean?

Hello,

A user is attempting to connect to the database with ODAC in direct mode and receiving the error "Net: Invalid VerifierType".  

What does this error mean and how can it be solved?

I see it in OraNetLogon.pas, around line 1529 but of course I can't tell what's going on there because the code is obfuscated.  :-(

Thanks.

John Dorlon