<Android Studio: Error no main class specified> I ...

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[user]

Android Studio: Error no main class specified
I created new project in Android Studio but after its build, I cannot click on play button "Make Project" because it is disabled. So, from drop down, I selected "Edit Configuration" and created an unnamed applciation configuration. Now whenever I run, it gives error:

Error: No main class specified


Following is the screenshot of configuration, What should I type in the fields?

https://i.stack.imgur.com/FQoGY.png▾