Pull the tray out to check if there is paper loaded in it. Load paper if the tray is empty.
Make sure the paper stack is properly loaded and the tray is not overfilled.
Notes:
If there is paper in the tray but the printer is not picking the paper, open the tray and flip the paper stack over.
Load a fresh ream of paper and observe whether the issue remains.
If the issue persists, remove the whole tray out and inspect the bottom of the tray for any paper debris or obstructions.
Open the printer rear door to see any paper stuck at the back, then remove it. Click here for an illustration.