Dear Forum Members:

I am using the Bootstrap Example Jumbotron with Nav Bar to build a website. I copied the entire bootstrap-4.0.0 folder / files and my index.html file to my Website Hosting Server.
The Nav Bar does not create the selection dropdown(s) when hover Dropdown Button. I get this error when I click on Dropdown button:

Example Domain
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I do know the fundamentals of JavaScript, CSS, HTML languages and coding.

Please help!