Why is the main method not being executed when using App in Scala?

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There could be a few reasons why the main method is not being executed in a Scala App:

1. Make sure that the main method is defined with the correct signature: def main(args: Array[String]): Unit. The main method must take an Array of Strings as its input parameter and return Unit.

2. Check that the App trait is mixed in to your class: class MyApp extends App. This is necessary in order for the main method to be automatically generated.

3. Ensure that there are no syntax errors or typos in your code that may prevent the program from compiling and running.

4. Check that you are executing the correct class file. If you are using an IDE, verify that the correct class is being run.

5. Look for any other code that may be blocking the main method from being executed. For example, if you have an infinite loop in your code, the main method may never be reached.