Thanks Nick. After reviewing your order history, I see you've purchased PK, LK + LM refillable cartridges. From your photo, it looks like the LM cartridge is causing the error.
Have you tried removing + reinserting the LM cartridge, making sure the cart is pushed in all the way for a good connection between the chip and chip sensor?
This error can appear when the chip and sensor don't have a good connection, or if the chip is not working correctly. When people have a full set of refillable carts installed, we recommend they turn the printer's chip sensor off to eliminate any chip related errors, but you can't do this since you have some Epson carts still installed (you wouldn't know the ink levels, and could run a cartridge dry without realizing).
Please let me know, thanks~ Dana