The Connect+® / SendPro™ P series displays error 0418-42-00A9 "Invalid ink cartridge is installed in spot (2) ink slot" and will not print.
There is an unrecognized ink cartridge in slot 2.
This system is set up to print with postal ink only. Remove the ink cartridge from slot 2.
If you would like your system to print with both postal ink and slot 2 (black) ink, contact your sales representative.
UPDATED: July 01, 2020