HP LaserJet Pro 400 Printer M401 series - Unexpected size in tray <X> Load <size> Press [OK]

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Unexpected size in tray <X> Load <size> Press [OK]

Description

The product has detected paper in the tray that does not match the configuration for the tray.

Recommended action

Load the correct paper into the tray, or configure the tray for the size that you have loaded.