My jmonkeyengine sdk 3.0 tell me my code is wrong but it still can run,why?

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as the picture

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sorry my English is poor ，please bear with me

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I copy the code from official website……

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like this

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i know ，i copy the line number again…… I‘m pig

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Perhaps you have a different startup project set when you press the Run-button… a project that works? Just a thought.