Be warned: if you simply clear the error, without performing the scheduled maintenance, there will be problems by and by, if not sooner.
Service Mode on this machine:
First press the Utility button,
then scroll to 'Clear Data,' and then 'Supplies Data' and clear.
Then exit service mode by turning the machine Off for several minutes or longer. Be careful in Service Mode, don't change anything but what you intend to and know about, or the machine might be crippled!
The drum counter, the developer counters, and other counters (that dictate the life and the replacement-time of consumable replaceable components in the machine) will be cleared. If these are not actually replaced too, copy/print quality will assuredly soon deteriorate.
(If this answers your question, please rate my answer. Thanks.)