unable to run, main file "main.sh" not found

Which lang did you choose?

main.sh files are shell files, you probably have to specify them somewhere else.

Can you attach the repl to the post please?

You just have to create a bash repl and run it from there. Then you can create other files like python, c, and code it from there.

unable to run, main file "Main.java" not found

why