AX Retail Pos Error Number 13000 – Could not load all external service modules

In Microsoft Dynamics AX, when we first install and configure Retail POS, and try to open our POS for the first time, a very common error 13000 appears, the info prompt with a warning that says;

 "13000 - could not load all external service modules" 

The problem occurs due to the missing dll. in C:\Program Files (x86)\Microsoft Dynamics AX\60\Retail POS\Connectors folder.

In such scenario, user needs to go to  C:\Program Files (x86)\Microsoft Dynamics AX\60\Client\Bin\Connectors folder, copy the Microsoft.Dynamics.Retail.TestConnector.dll from the location and paste it under C:\Program Files (x86)\Microsoft Dynamics AX\60\Retail POS\Connectors folder.