Editor does not contain a main type

I have this problem a lot with Eclipse and Scala. It helps if you clean your workspace and rebuild your Project.

Sometimes Eclipse doesn't recognize correctly which files it has to recompile :(

Edit: The Code runs fine in Eclipse

In Eclipse, make sure you add your source folder in the project properties -> java build path -> source. Otherwise, the main() function may not be included in your project.

A simpler way is to close the project and reopen it.