Wsrtjtyk

I have my site running well on my local but when I uploaded it, the php code gets some error,

Warning: mysqli::prepare(): Couldn't fetch mysqli in /home/gh/public_html/abida/C/login.php on line 15

Fatal error: Call to a member function bind_param() on null in /home/gh/public_html/abida/C/login.php on line 16

        <?php

    require '../api/dbcon.php';

    require '../api/apiOnly.php';

          if(session_id() == '' || !isset($_SESSION)) {

        // session isn't started

                 session_start();

              }  

    //FACULTY - USER LOGIN

    if(isset($_POST['login'])){

      //do query here

      $stmt = $conn->prepare('SELECT username, campus, designation FROM accounts where username = ? AND password = ? ');

      $stmt->bind_param('ss', $u, $p);

      $u=$_POST['username'];

      $p=md5($_POST['password']);

      $stmt->execute();

      $stmt->bind_result($username,$campus, $designation);

      if($stmt->fetch()>0){

       $_SESSION['usr_fullname'] = $username;

       $_SESSION['usr_type'] = $designation;

      $_SESSION['usr_campus'] = $campus;

       if($_SESSION['usr_type']=='admin'){

    header('location: home.php');

       exit();

       }else if($_SESSION['usr_type']=='director'){

       header('location: director-index.php');

       exit(); 

       }

      }else{

     $faculty = json_decode($api->authenticate_student($_POST['username'],$_POST['password']),true);

       if(!empty($faculty[0]['usr_fullname'])){

       $_SESSION['usr_fullname'] = $faculty[0]['usr_fullname'];

        $_SESSION['usr_type'] = 'faculty';

        header('location: faculty-index.php');

       }else{

            echo "<script type='text/javascript'>

                    alert ('Username and Password unmatched!'); 

                    window.location.href='login.php';</script>";

    } 

      }

      $stmt->close();

      $conn->close();

    }

    ?>

dbcon.php

      <?php

   if(session_id() == '' || !isset($_SESSION)) {

// session isn't started

         session_start();

      }  

     error_reporting(E_ALL & E_STRICT);

     ini_set('display_errors', '1');

     ini_set('log_errors', '0');

     ini_set('error_log', './');



     $dbhost = 'localhost';

     $dbuser = '------';

     $dbpass = '------';

     $dbtable = "-----";

     $conn = new mysqli($dbhost, $dbuser, $dbpass, $dbtable);



     if(!$conn ){

        die('Could not connect: ' . mysqli_error());

     }

  ?>

Sorry I am new to this, should I change the localhost too? where can I find the right name to put there.

Declare

$stmt->bind_param('ss', $u, $p);

After

  $u=$_POST['username'];

  $p=md5($_POST['password']);