If you are getting this error after installing a new POS terminal
Open the GIVEX.INI located here on the server C:\Program Files (x86)\MicrosGivex\
Ensure that you create a new line for the POS Device # that matches the POS you installed.
On the example image below, you will notice that Serv4 Number 12 is not on the givex.ini
Copy a line above and replace the "XX" with the POS number. like so
Restart the Givex SVC Adapter