The solution above worked for me. I was getting the same error message while connecting to database via USB and using XP pro.
Went to menu, POWER DOWN. Unplugged unit power, replugged power back in.
Start Emplode. All worked well...

RioCar
Beta 2.0beta11 emplode and firmware
WIN XP PRO
ATHLON 1200
RIOCAR ON USB AND COM1