I have had this error for some time as well. It might be some kind of netbeans bug that has to do with netbeans connector. I can't find any mention of favicon.ico
in my code or in the project settings.
I was able to fix it by putting the following line in the head
section of my html file
<link rel="shortcut icon" href="#">
I am currently using this in my testing environment, but I would remove it for any production environment.
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