'How do you set the 'Edit Configuration' in IntellIJ?

After I deleted a file that I thought I didn't need, all of my java classes won't run and instead a window pops up asking me to edit configuration.

What should I do to make the java classes run again?

Here is the current status of my screen



Solution 1:[1]

Try the following:

  1. Exit IntelliJ
  2. Delete .idea directory
  3. Open the project in IntelliJ

Sources

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Source: Stack Overflow

Solution Source
Solution 1 lazap