Hi there
You should always mention the printer model as well as what operating system you use.
This is what i found on LEXMARK's website about your error, and it seems you have one or 2 faulty cartridges, or you are using compatible cartridges instead of Lexmark Originals:
Problem
Error messages; Error: "Cartridge Error 50C"; Cartridge error; Black cartridge missing; Color cartridge missing
Solution
Cartridge Error 50C
Your print cartridge has shorted.
- Power off your All-in-One and unplug it.
- Plug in your All-in-One again and turn it on.
- Uninstall and then reinstall your cartridges.
- If this does not resolve the issue, try the troubleshooting steps for the other cartridge errors below.
Error: Black Cartridge Missing The black cartridge is not installed. (Install cartridge PN 82)
Error: Color Cartridge MissingThe color cartridge is not installed (Install cartridge PN 83)
Cartridge Error
Complete the following instructions:
- Power off your All-in-One.
- Use both hands to lift up the scanner unit until the scanner support holds it open.
- Turn the All-in-One on. The print cartridge carrier moves and stops at the loading position, unless the All-in-One is busy.
- Remove the color print cartridge.
- Lower the scanner unit until it is completely closed.
- If the error message reappears, replace the black print cartridge with a new print cartridge.
If it does not repeat steps 1-3 and then go to step 7.
- Reinstall the color cartridge and remove the black print cartridge.
- Lower the scanner unit until it is completely closed.
- If the error message occurs again, replace the color cartridge.
- If an error message reappears, repeat steps 1-3 and reinstall both print cartridges.
- Lower the scanner unit until it is completely closed.
- If you receive the error message again, replace both cartridges.
Hope it helps
Andre