Idea Run code error (7,8) ***app is already defined as Object App object app extends application {wrong solution (graphic)

Not much to say, directly on the dry goods!

problem Phenomenon

Error (7,8) is   already  defined as    Object   App Object APP  extends Application  

　　

Cause of the problem

You're amplifying your authority.

HELO is Alreay defined as Object helo

public class Helo {

　Solutions

1, File--Project Structure

2, Main, do not need to enlarge the permissions

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Idea Run code error (7,8) ***app is already defined as Object App object app extends application {wrong solution (graphic)