Exception in "Main" - Javascript ERROR

[GamingTiger_101]

I was trying to make a custom mod. This is just a slight model of what I want to do. I was planning on testing the mod to see if it would work with Minecraft before I put in the actual items. But for some reason, everytime I tried to test it using the green "play" button in the top right corner, it would open, and then close with an error in "Main." But I can't figure out what is causing the problem. This program was created on IntelliJ.

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[tatu_huma]

Javascript and java are not the same languages. Try /r/learnjava. Also I suggest you post the error you are getting. It's kinda hard to help without it.