Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
please open devices and printers
right click on the printer icon and set printer as default
once done try to convert the invoice file again
please ensure that the printer selected is brother mfc
let me know how it goes and i will suggest further
Remove all one by one and then restart the computer. Reinstall a new copy after you reboot after the removal of the old drivers.
Let me know if you need secure remote assistance?