My slide navigation doesn't apear? (Fullpage.js)

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Javascript

CSS

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I'm building my fullpage page using fullpage.js library by following some tutorial videos.
The fullpage view is fine.but In the middle of the process,my slide navigation doesn't appear and the link on the navbar can't direct the page to the section that.

i assume the scripts and css files that i link is not correct.But i'm not sure.

<script src="js/jquery-3.3.1.min.js"></script>
    <script src="js/fullPage.min.js"></script>
    <script src="js/jquery.fullPage.min.js"></script>
    <link rel="stylesheet" href="css/fullPage.min.css">
    <link rel="stylesheet" href="css/jquery.fullPage.css">

<div id="navbar">
       <a href="#page1">Page 1</a>
       <a href="#page2">Page 2</a>
       <a href="#page3/slide1">Page 3</a>
       <a href="#page3/slide2">Page 3-2</a>
       <a href="#page3/slide3">Page 3-3</a>
       <a href="#page4">Page 4</a>
   </div>
   <div id="container">
       <section  data-anchor="page2">
           <h1>Galih Indra</h1>
           <p>Web Developer</p>
       </section>
       <section  data-anchor="page2">
           <h1>About</h1>
       </section>
       <section  data-anchor="page3">
           <div class="slide"  data-anchor="slide1"><img src="https://source.unsplash.com/random"   /></div>
           <div class="slide"  data-anchor="slide2"><img src="https://source.unsplash.com/random"   /></div>
           <div class="slide"  data-anchor="slide3"><img src="https://source.unsplash.com/random"   /></div>
       </section>
       <section>
           <h1>Experiments</h1>
       </section>
   </div>
   <script>
       $(document).ready(function () {
           $('#container').fullpage({
               //options here
               autoScrolling: true,
               scrollHorizontally: true,
               scrollingSpeed: 300,
        controlArrows: false
           });

           //methods
           $.fn.fullpage.setAllowScrolling(false);
       });

What I have tried:

Can someone help me to find the error?