Dear Aspirant,

Need not worry at all. It might have been only a technical glitch

Enter your application number again when the internet traffic is down. Everything shall be fine.

In order to know what colleges you might get, you may yon this link:-

https://engineering.careers360.com/jee-advanced-college-predictor?icn=QnA&ici=qna_answer

Hopefully,this link shall serve as the guru leading you to your destination. See if these colleges are providing the branch of your choice and the placement scenario in that college.