ℹ
info HP
Status Fast blinking
There is no paper in the input tray.
? What Causes This
No paper loaded in the input tray.
ⓘ What This Means
Load paper into the input tray and press Resume button.
Source: page 6 of the official manual
From the manual
This error code appears in:
HP Deskjet Ink Advantage 2135 All IN One Printer