Printer driver conflict.

 NOTE: This solution requires removing all non-Microsoft printers and printer drivers from the computer. Make sure you have the software/drivers needed to reinstall the printers. 

[BCB:4:Operating system warning:ECB] 

1. From the Windows Start menu, select Devices and Printers. 
2. Delete all non-Microsoft installed printers. Don’t delete Microsoft XPS Document Writer and Microsoft Office Document Image Writer Driver.
3. Once you uninstall the printers, click File and select Server Properties. 
4. From the Print Server Properties screen, click the Drivers tab.
5. Delete all non-Microsoft installed printer drivers. Don’t delete drivers for Microsoft XPS Document Writer and Microsoft Office Document Image Writer Driver.
6. If prompted to "Remove Driver Only" or "Remove Driver and Driver Package," select Remove Driver and Driver Package.
7. Run a repair on the Sage 50 installation.
8. Verify that the Sage 50 E-mail Writer v3 printer installed.
9. Reinstall the needed printers.
10. Confirm that emailing and printing function properly.