Error: "-2147467259 class not registered." in Sage 300

Cause

Workstations were not reinstalled after a Product update.

Resolution

Try the following:

1. Reinstall Workstation Setup
2. Restart Workstation

If that did not work, try the following:

1. Uninstall Workstation Setup.
2. Restart the PC.
3. Install Workstation Setup.