Dear candidate,

This might be a case that you have not filled correctly your ROC Form number which was given to you  during certificate verification or there is certainly any mis match in hall ticket no. , rank and date of birth. If you have mad mistake while filling any of these fields then then you cannot proceed to the next step i.e candidate registration and password generation. You may check the official website for details. Also try to again fill all the details properly if still it doesn't show the candidate registration then you can contact to the department. There should be a helpline number at its website . The official link is below.

https://tseamcet.nic.in/default.aspx

Hope it helps.