"Unable to open Bootstrap menu"

I searched for a long time why my Bootstrap menu doesn't open.

I first linked JQuery to make it work, but nothing seems to change. I don't know if there is anything missing. My console shows no message that JQuery is missing.

This is my application.html.erb

<!DOCTYPE html>
<html>
  <head>
    <title>Peachux</title>
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <%= csrf_meta_tags %>
    <%= csp_meta_tag %>

    <%= stylesheet_link_tag "application", "data-turbo-track": "reload" %>
    <%= javascript_include_tag "application", "data-turbo-track": "reload", defer: true %>


    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <link href="https://assets.calendly.com/assets/external/widget.css" rel="stylesheet">
    <script src="https://assets.calendly.com/assets/external/widget.js" type="text/javascript" async></script>
    <script src="https://kit.fontawesome.com/b43f353bd3.js" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.12.9/dist/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.0.0/dist/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

  </head>

  <body>
    <%= render "shared/navbar" %>
    <%= render "shared/flashes" %>
    <%= yield %>
    <%= render "shared/footer" %>
  </body>
</html>

And my application.scss

// 图形变量
@import "config/fonts";
@import "config/colors";

// 外部库
@import "bootstrap/scss/bootstrap";
@import "font-awesome";

// 你的CSS部分
@import "components/index";
@import "components/banner";
@import "components/button";
@import "components/work-card";
@import "components/work-header";
@import "components/profile";
@import "components/form";
@import "components/link";
@import "components/advantages-block";
@import "components/newsletter-block";
@import "components/testimonials";
@import "components/footer";

// 页面部分
@import "pages/home";
@import "pages/index";
@import "pages/works";
@import "pages/about";

thank you for your support!

P粉769045426295 days ago417

"Unable to open Bootstrap menu"

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