Used capsule container icon flashes; machine refuses to brew even when container is empty

User checks:

• Remove, empty, and clean the used capsule container and drip tray.
• Reinsert them fully until they click into place.
• Inspect for broken plastic tabs that engage the sensor.

Sensor checks:

• Locate the container sensor (reed switch, Hall sensor, or optical interrupter) inside the machine.
• Clean the sensor area and ensure no coffee grounds block it.
• Test and replace the sensor if it does not respond when the container is inserted.