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I think you should remove the ink cartridge, double-check that it is the right 'type-number', that it is in the right slot, that protective tape has been removed from it properly, and then put it back in the right slot, and push it in firmly until you hear a 'click' of its being seated properly.
Then close all covers, and wait a bit.
- If the error message clears, press the ink-drop button once.
- If the message does not clear, turn the printer Off. Wait 5+ minutes... then turn it On again. If the error message then clears, press the ink-drop button, once... and if the error message still persists, let me know whether the cartridge is Epson OEM-original, or a refill, or remanufactured, or 'Epson compatible'... and what type-number it is, please.