What should I do if idea cannot find or load the main class?

What should I do if the main class cannot be found or cannot be loaded?

The main class cannot be found or cannot be loaded because the correct Class path

The solution is as follows:

1. Click on the red circle above, then click Edit Configuration to enter the setting interface below.

2. Switch to the interface below

3. The red × disappears and the operation is normal. The screenshot is as follows

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