Go to section on Error Messages at page 32 of the User Guide found at:
http://gdlp01.c-wss.com/gds/0/0300002060/02/SELPHYCP780_PUG_EN_03.pdf
It will tell you to remove and reinstall the ink cassette. Try this and make sure you install correctly as per instructions on page 11 of the User Guide.
If this does not resolve the problem, do a complete power down of the printer. Turn off and unplug from the power supply. Lets rest fro a few minutes and then plug back in to the power supply and if necessary turn on power. This should allow your printer to reset and hopefully recognize that a new ink cassette has been installed.
Trust this helps. Please vote. :)
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