Check the following points to resolve the issue:

You installed a new ink cartridge too quickly and the machine did not detect it.

Take out the new ink cartridge and reinstall it slowly and firmly until it locks into place.
> Click here to see how to replace the Ink Cartridge.

An ink cartridge is not installed correctly.

Take out the new ink cartridge and reinstall it slowly and firmly until it locks into place.
> Click here to see how to replace the Ink Cartridge.

If you are using non-genuine Brother ink, the machine may or may not detect the ink cartridge.

Use a new ink cartridge. If the error message is not cleared, contact Brother Customer Service from the "Contact Us" section.

The wrong Brother model ink cartridge was installed.

Check the model number of the ink cartridges and install the correct ink cartridges.
Visit the Consumables & Accessories section on this web site to know what consumables are available for your machine and its ink cartridge model numbers.
> Click here to see the Consumables & Accessories section.