RETAIL POINT UPGRADE TO VERSION 9.20 ERROR ON TILL

Good day All,

We recently upgraded a Branch Accounting Site which also has retail Point of Sale from 7.00.207 to Version 9.20.

When the Till operator tries to Scan a barcode this is the error they are getting. Anyone who has experienced this before?  This is happening on all the tills at all branches.

May you kindly assist.