9.2.1. Exception occurred in AddOnLoader
Edit the DI-API configuration file to set server name: Go to C:\Program Files (x86)\SAP\SAP Business One DI API\Conf and Edit the b1-local-machine.xml file
In this file, change the LicenseServer <value> from localhost to the correct server name and save the file.
Now restart SAP Business One with the PDMX add-on and the problem should be solved.
If the error is still there, please re-install SBO DI-API on this client.