Epson is the printer manufacturer that introduces the ink tank system.
Unlike a multifunction equipment, this printer is built for printing only.
It uses four colors and a print head consisting of hundreds of nozzles to spray the ink onto paper.

Features and Highlights
The Epson L1211 weighs 2.8 kg.
Each is also easily refillable.
It comes from a number of printer routines, which includes but not limited to print head cleaning.

The easiest solution for this situation is to get yourself a copy of Epson L1211 Resetter.
It is this counter that triggers the printer to show the alert message and stop printing.
The message will be displayed from time to time.

However, note that this reset is only a temporary solution.