Hi @KanakOP thanks for your post and welcome to the community!
In order for the community to suggest ideas to help you solve your code issue it would be useful to share a link to your Repl.
sorry I can’t help you, I’m having the same problem. 
On the occasions which I met this problem, it occurred because the repl was loaded in two tabs, and in one of the tabs I renamed the repl. This causes one of the tabs to try to load a non-existing repl.
This could be caused when:
- The server can’t find the Repl
- there is some corruption in one of the files
- There is too much traffic going through the servers
Usually resetting the connection by turning off and on your wifi, or restarting your computer.
Otherwise, the only thing to do is just wait, it will eventually come back on on its own. (i can be wrong about this, but this is how it basically works)
Hi @Infinityus welcome to the community. Can you post a link to your Repl (the one that is displaying the error message you reported)?