What is run time error?

Question

I try to solve some programming problems in codeforces.com using python 3
But most of the time i have got Run time error in my submitted code.
i can't fix my code as i don't know why it happens.
so,what is this run time error?
and how can i fix this problem?

Answer 1

Depends upon your code. Just means when it went to run it generated an error and closed. Post your code if you want specific help.

Answer 2

Essential Python 3 works here. I second @Netkos Ent's answer.