During the neet registration process in counselling it is showing roll no already registered .. but i did not register till now what to do

After neet results i got the date for online registration  when i am entering my details ots showing roll number already registered there is no option for forget password n all.. only validate is given 

I registered to neet last year only. But now i entered my application number , password and sensitive pincode then it is showing your entered password is wrong but i entered this password last for checking my result and also for neet phase2 registration . Then i clicked to forgot password and chose to change password by message sent via registered mobile number , its showing you are not registered. What should i do? And also why it is happening like this