Cause
An ink cartridge in the printer isn't properly installed.
What to Do
Open the scanning unit / cover to open the ink cartridge locking cover, and then remove the ink cartridge.
Make sure that the ink cartridges are compatible with this printer.
Then install the cartridges again.
Press down the ink cartridge locking cover until it clicks into place.
After you install the cartridge, close the scanning unit / cover.
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