I\'m running IntelliJ Idea under linux. I have created a project and a module inside it, and in that module I have a class (MyClass.class) and when I\'m trying to run it from ID
Check that Make checkbox is enabled, otherwise IDEA will not compile your project, also verify that class file is available in the output directory and you are running with the classpath of the correct module.
If the problem remains, send a sample project to support.