All of sudden when I start my drone there is humming sound coming from gimbal and app says error 40002 & 40003 tried blowing up dust but problem remains same

Hello there raunit.ranjan. I am sorry for the trouble this has caused and thank you for reaching out Can you please check the gimbal of your DJI drone if there is debris stuck in the gimbal and kindly please try to restart the said DJI drone then perform the gimbal calibration and check if the issue persists. If the issue still persist  I would recommend you to contact our DJI support team at https://www.dji.com/support?site=brandsite&from=nav for further assistance. We have a team that will do there best to help you and give out the best resolution for this issue. Thank you.