The drip tray and waste container have not been inserted correctly in the coffee machine.
Empty the drip tray and the waste container.
Reinsert the drip tray and waste container.
Insert the drip tray and the waste container appears on the coffee machine display.
Empty the drip tray and the waste container.
Reinsert the drip tray and waste container.
When you open the coffee machine, you must always empty the drip tray and waste container.