How can I avoid error 01 in the future?

To prevent error 01, ensure your toner cartridge is properly installed and securely locked in place. Avoid overfilling the toner cartridge. Regularly check the toner level and replace the cartridge before it runs completely empty. Keep the printer clean from dust and debris, as this can affect the toner sensor. Also, avoid using the printer for extended periods without a toner cartridge installed.