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Error: listen EADDRINUSE: address already in use :::3000
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I created a simple example using Node.js and Express. It works as expected:

But I created a new one and I added Babylon.js game engine. My example does not work: I see the error: Error: listen EADDRINUSE: address already in use :::3000

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Answered by Coder100 [earned 5 cycles]
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I had the same mistake, and it was because I was traying to start the server using "npm start" on the shell and running the server using the play button at the same time. I could solve this error running the server using only the play button. I hope this can help you.

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are you able to run my example or does it say that it is unpublished?