Error Code Use black ink only?

Alert to use only black ink for continued printing when color cartridges are very low on ink.

? What Causes This

Color cartridges do not have sufficient ink to continue normal full-color print jobs.

Replace empty cartridges with new ones or proceed using grayscale output in lieu of full-color until replacements arrive.

Source: page 239 of the official manual

From the manual

This error code appears in: