What is the primary cause of the 'error could not find or load main class netbeans' error when running a Java program in NetBeans?

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Grade: Education Subject: Support
What is the primary cause of the 'error could not find or load main class netbeans' error when running a Java program in NetBeans?
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The most common cause is an issue with the classpath. This can be due to incorrect project configuration, missing dependencies, or the absence of a `main()` method in the specified class. Ensure the correct project settings are selected (Java Application), and all required libraries are properly added to the project.