PHP SLIM framework/mysql mysqlnd issue on live server

Question

Here is the link. You need to register and login to view this page... You can use sample fake email id for it. Thnx :) I am using PHP SLIM framework to create API & the code is working fine on localhost but its giving following error on live

<b>Fatal error</b>:  Uncaught Error: Call to undefined method mysqli_stmt::get_result() in /home/u474389745/public_html/php_slim/task_manager_angular/api2/include/DbHandler.php:338 Stack trace: #0 /home/u474389745/public_html/php_slim/task_manager_angular/api2/v1/index.php(175): DbHandler-&gt;getAllUserTasks(29) #1 [internal function]: {closure}() #2 /home/u474389745/public_html/php_slim/task_manager_angular/api2/libs/Slim/Route.php(436): call_user_func_array(Object(Closure), Array) #3 /home/u474389745/public_html/php_slim/task_manager_angular/api2/libs/Slim/Slim.php(1307): Slim\Route-&gt;dispatch() #4 /home/u474389745/public_html/php_slim/task_manager_angular/api2/libs/Slim/Middleware/Flash.php(85): Slim\Slim-&gt;call() #5 /home/u474389745/public_html/php_slim/task_manager_angular/api2/libs/Slim/Middleware/MethodOverride.php(92): Slim\Middleware\Flash-&gt;call() #6 /home/u474389745/public_html/php_slim/task_manager_angular/api2/libs/Slim/Middleware/PrettyExceptions.php(67): Slim\Middleware\MethodOverride-&gt;call() #7 /home/u474389745/public_h in  <b>/home/u474389745/public_html/php_slim/task_manager_angular/api2/include/DbHandler.php</b> on line <b>338</b><br />

Below is my function call

$app->get('/tasks', 'authenticate', function() {
        global $user_id;
        $response = array();
        $db = new DbHandler();

        // fetching all user tasks
        //line no 175 of index.php error detected by debug tool
        $result = $db->getAllUserTasks($user_id);

        $response["error"] = false;
        $response["tasks"] = array();

        // looping through result and preparing tasks array
        while ($task = $result->fetch_assoc()) {
            $tmp = array();
            $tmp["id"] = $task["id"];
            $tmp["task"] = $task["task"];
            $tmp["status"] = $task["status"];
            $tmp["createdAt"] = $task["created_at"];
            array_push($response["tasks"], $tmp);
        }

        echoRespnse(200, $response);
    });

And here i am fetching all data

public function getAllUserTasks($user_id) {
     $stmt = $this->conn->prepare("SELECT t.* FROM tasks t, user_tasks ut WHERE t.id = ut.task_id AND ut.user_id = ?");
     $stmt->bind_param("i", $user_id);
     $stmt->execute();
     //line no 338 in DbHandler.php error detected by debug tool
     $tasks = $stmt->get_result();
     $stmt->close();
     return $tasks;
 }

//in 338 line DbHandler.php $tasks = $stmt->get_result();

Please check angular function

$scope.get_all_task = function(add){
    $http({
    method: 'GET',
    url: 'api2/v1/tasks',
    crossDomain: true,
    dataType: "json",
    contentType: 'application/json',
    headers: {'authorization': localStorage.getItem("login_api_angular"),'Content-Type': 'application/x-www-form-urlencoded'},

    }).success(function (response, data, textStatus, jqXHR) {

        console.log(response.tasks);  
        console.log(textStatus);
        console.log(jqXHR);     
        $scope.task1 = response.tasks;


    }).error(function (response, data, textStatus, jqXHR) {
        console.log(response.message);  
        angular.element(document.getElementById('data_info_p')).append(response.message+' Please Login');
    });       
};

And this is html part

<table data-ng-controller="authCtrl" data-ng-init="get_all_task()" width="100%"><tbody id="data_info_p"><tr ng-repeat="task22 in task1">
<td>{{task22.task}}</td></tr></tbody></table>