UI Connection error that is linked to the user that installed the add-on did not have correct permission to the Windows folder system and the windows Registry. Try the following to solve the problem:
- Log in as a Windows administrator
- Start SAP and go to Administration > Add-ons > Add-on Administration
- Move the B1 Usability Package from the Company Assigned Add-ons to the Available Add-ons
- Restart SAP and re-assign the add-on
If the above does not work try reinstalling the add-on (using a windows administrator).