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error HP
Error Code LED blinking and one Ink Alert light is blinking
The corresponding ink cartridge is incompatible, damaged, or incorrectly installed.
? What Causes This
Ink cartridge issues due to compatibility problems, physical damage, or improper installation.
✓ How to Fix It
Remove the ink cartridge and reinsert it properly after checking for correct model and removal of any plastic tape if present.
Source: page 6 of the official manual
From the manual
This error code appears in:
HP Deskjet Ink Advantage 2135 All IN One Printer