Multi-Value Select Boxes with search DB not work

Hello,
I’m new to select2. I try to create a multi-value with the search on DB.
I try to create a local test but I do not work (the search does not work). When I try to enter the search the box does not appear.
On the tag head i insert only this

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.min.js"></script>

It’s correct?

This is my code https://pastebin.com/STxNWT9s

Thanks guys!