Error: Module not specified (IntelliJ IDEA)

This is because the className value which you are passing as argument for
forName(String className) method is not found or doesn’t exists, or you a re passing the wrong value as the class name. Here is also a link which could help you.



Module not specified

According to the snapshot you have provided this problem is because you have not determined the app module of your project, so I suggest you to choose the app module from configuration. For example:

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