Hello divya,

I think you have my have entered wrong details once check your hall ticket enter all the details.

Even through if it shows error try to contact helpline center through phone call and mail. These are the contact details which i have mentioned in below:
Phone: 9573927391 and 9573965878
Email: convenertseamcet2020a@jntuh.ac.in  (https://eamcet.tsche.ac.in/TSEAMCET/ContactUS.aspx#) | convenertseamcet2020b@jntuh.ac.in (https://eamcet.tsche.ac.in/TSEAMCET/ContactUS.aspx#)

I hope it helps you.