You may be able to clear OS X errors such as Error 300 by deleting then re-adding the printer in System Preferences Open Printers & Scanners in System Preferences Click the Minus (-) to delete the printer
If the MP Navigator EX or the MP drivers are no longer required, or if they are not installed correctly, uninstall them. Reinstall the drivers if error messages occur or if the device does not operate correctly.
If the MP Navigator or the MP drivers are no longer required, or if they are not installed correctly, uninstall them. the drivers if error messages occur or if the device does not operate correctly.