html - Nav Bar collapse not working -

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here nav bar navbar don't open when in mobile mode please me navbar shows drop down button nothing happens in mobile mode please help

<nav class="navbar navbar-inverse navbar-fixed-top">     <div class="container">         <div class="navbar-header">             <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">                 <span class="sr-only">toggle navigation</span>                 <span class="icon-bar"></span>                 <span class="icon-bar"></span>                 <span class="icon-bar"></span>             </button>             <a class="navbar-brand" href="index.php">theatre</a>         </div>         <div id="navbar" class="collapse navbar-collapse">             <?php if (isset($_session['user'])) { ?>                   <ul class="nav navbar-nav navbar-right">                     <li class="navbar-right"><a href="./logout.php" class="btn btn-danger" style="color:whitesmoke;">logout</a></li>                 </ul>                 <ul class="nav navbar-nav">                     <li <?= echoactiveclassifrequestmatches("index") ?>>                         <a href="index.php">home</a></li>                     <li <?= echoactiveclassifrequestmatches("productions") ?>>                         <a href="productions.php">productions</a></li>                     </ul>                  <form class="navbar-form navbar-left" role="search">                     <div class="form-group">                         <input type="text" class="form-control" placeholder="search">                     </div>                     <button type="submit" class="btn btn-default">submit</button>                 </form>                   <?php             } else {                 ?>                 <form class="navbar-form navbar-right" action="index.php" method="post">                     <div class="form-group">                         <input type="text" placeholder="email" name ="email" class="form-control">                     </div>                     <div class="form-group">                         <input type="password" placeholder="password" name="password" class="form-control">                     </div>                     <button type="submit" name="login" class="btn btn-success">sign in</button>                     <a href="./register.php" class="btn btn-warning">register</a>                 </form>             <?php }             ?>          </div><!--/.navbar-collapse -->     </div> </nav>

you should use

 1 <ul> , many <li> navigation (not many <ul> , <li>

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