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Fatal error: Uncaught Error: Call to a member function bind_param() on bool in db.php21 Stack trace:#0 db.php92 executeQuery'INSERT INTO pos', Array#1

Hello So to make things clear This is the full text of the error because i dont have enough space to type it on my title "Fatal error: Uncaught Error: Call to a member function bind_param() on bool in C:\xampp\htdocs\movieworld\app\database\db.php:21 Stack trace: #0 C:\xampp\htdocs\movieworld\app\database\db.php(92): executeQuery('INSERT INTO pos...', Array) #1 C:\xampp\htdocs\movieworld\app\controllers\posts.php(77): create('posts', Array) #2 C:\xampp\htdocs\movieworld\admin\posts\create.php(2): include('C:\xampp\htdocs...') #3 {main} thrown in C:\xampp\htdocs\movieworld\app\database\db.php on line 21"

Ok so let me explain how I'm struggling even though i have a tutorial that i'm following I am following Awa Melvine's blog tutorial (https://www.youtube.com/watch?v=-tfqW25lKvo&list=PL3pyLl-dgiqD0eKYJ-XSxrHaRh-zsA2tP&index=23 ) but for some reason when i am trying to post something i am getting this error and i am not sure why and i hope you guys do

DISCLAIMER DO NOT JUGDE THE COMMENTS ITS IN GREEK

here is Db.php

<?php

session_start();
require('connect.php');



function Printer($value) // Printer
{
    echo "<pre>", print_r($value, true), "</pre>";
    die();
}


function executeQuery($sql, $data)
{
    global $conn;
    $stmt = $conn->prepare($sql);
    $values = array_values($data); //pernoume tis times pou tha mpou sto stin conditions
    $types = str_repeat('s', count($values)); //blepoume to idos tou value pou pirame 
    $stmt->bind_param($types, ...$values);//edo ginete kai me ... alla malon exo palia version 
    $stmt->execute();
    return $stmt;
}

// epistrefi oles tis times pou tairiazoun me ta conditions sto data base table 
function selectAll($table, $conditions = []) 
{
    global $conn;
    $sql = "SELECT * FROM $table";
    if (empty($conditions)) {
        $stmt = $conn->prepare($sql);
        $stmt->execute();
        $records = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
        return $records;
    } else {
        $i = 0;
        foreach ($conditions as $key => $value) {
            if ($i === 0) {
                $sql = $sql . " WHERE $key=?";
            } else {
                $sql = $sql . " AND $key=?";
            }
            $i++;
        }
        
        $stmt = executeQuery($sql, $conditions);
        $records = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
        return $records;
    }
}

//peripou to idio me epano apla pleon einai mono ena array anti gia emfoleumena 
function selectOne($table, $conditions)
{
    global $conn;
    $sql = "SELECT * FROM $table";

    $i = 0;
    foreach ($conditions as $key => $value) {
        if ($i === 0) {
            $sql = $sql . " WHERE $key=?";
        } else {
            $sql = $sql . " AND $key=?";
        }
        $i++;
    }

    $sql = $sql . " LIMIT 1"; //auto einai gia na stamatisi epitopou an bri kapoio admin kai username pou tairiazi
    $stmt = executeQuery($sql, $conditions);
    $records = $stmt->get_result()->fetch_assoc();
    return $records;
}


function create($table, $data)
{
    global $conn;
    // $sql = "INSERT INTO $table SET username=?, admin=?, email=?, password=?"
    $sql = "INSERT INTO $table SET ";

    $i = 0;
    foreach ($data as $key => $value) {
        if ($i === 0) {// gia auto elegxoume edo tin prwti timi
            $sql = $sql . " $key=?"; 
        } else {
            $sql = $sql . ", $key=?"; //to "," edo mpaini se periptosi pou den einai i proti epologi diladi , admin=?, email=?, password=?
        }
        $i++;
    }
    
    $stmt = executeQuery($sql, $data);
    $id = $stmt->insert_id; //etsi otan ftiaxnoume records mporoume na epistrepsoume apla to id 
    return $id;
}



function update($table, $id, $data)
{
    global $conn;
    // $sql = "UPDATE users SET username=?, admin=?, email=?, password=? WHERE id=?"
    $sql = "UPDATE $table SET ";

    $i = 0;
    foreach ($data as $key => $value) {
        if ($i === 0) {
            $sql = $sql . " $key=?";
        } else {
            $sql = $sql . ", $key=?";
        }
        $i++;
    }

    $sql = $sql . " WHERE id=?";
    $data['id'] = $id;
    $stmt = executeQuery($sql, $data);
    return $stmt->affected_rows;
}



function delete($table, $id)
{
    global $conn;
    $sql = "DELETE FROM $table WHERE id=?";

    $stmt = executeQuery($sql, ['id' => $id]);
    return $stmt->affected_rows;
}


function getPublishedPosts()
{
    global $conn;
    $sql = "SELECT p.*, u.username FROM posts AS p JOIN users AS u ON p.user_id=u.id WHERE p.published=?";

    $stmt = executeQuery($sql, ['published' => 1]);
    $records = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
    return $records;
}


function getPostsByTopicId($topic_id)
{
    global $conn;
    $sql = "SELECT p.*, u.username FROM posts AS p JOIN users AS u ON p.user_id=u.id WHERE p.published=? AND topic_id=?";

    $stmt = executeQuery($sql, ['published' => 1, 'topic_id' => $topic_id]);
    $records = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
    return $records;
}

function searchPosts($term)
{
    $match = '%' . $term . '%';
    global $conn;
    $sql = "SELECT 
                p.*, u.username 
            FROM posts AS p 
            JOIN users AS u 
            ON p.user_id=u.id 
            WHERE p.published=?
            AND p.title LIKE ? OR p.body LIKE ?";


    $stmt = executeQuery($sql, ['published' => 1, 'title' => $match, 'body' => $match]);
    $records = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
    return $records;
}

thats post.php

<?php

include(ROOT_PATH . "/app/database/db.php");
include(ROOT_PATH . "/app/helpers/middleware.php");
include(ROOT_PATH . "/app/helpers/validatePost.php");

$table = 'posts';

$topics = selectAll('topics');
$posts = selectAll($table);


$errors = array();
$id = "";
$title = "";
$body = "";
$topic_id = "";
$published = "";

if (isset($_GET['id'])) {
    $post = selectOne($table, ['id' => $_GET['id']]);

    $id = $post['id'];
    $title = $post['title'];
    $body = $post['body'];
    $topic_id = $post['topic_id'];
    $published = $post['published'];
}

if (isset($_GET['delete_id'])) {
    adminOnly();
    $count = delete($table, $_GET['delete_id']);
    $_SESSION['message'] = "Post deleted successfully";
    $_SESSION['type'] = "success";
    header("location: " . BASE_URL . "/admin/posts/index.php"); 
    exit();
}

if (isset($_GET['published']) && isset($_GET['p_id'])) {
    adminOnly();
    $published = $_GET['published'];
    $p_id = $_GET['p_id'];
    $count = update($table, $p_id, ['published' => $published]);
    $_SESSION['message'] = "Post published state changed!";
    $_SESSION['type'] = "success";
    header("location: " . BASE_URL . "/admin/posts/index.php"); 
    exit();
}



if (isset($_POST['add-post'])) {
    //adminOnly();
    $errors = validatePost($_POST);

    if (!empty($_FILES['image']['name'])) {
        $image_name = time() . '_' . $_FILES['image']['name'];
        $destination = ROOT_PATH . "/assets/images/" . $image_name;

        $result = move_uploaded_file($_FILES['image']['tmp_name'], $destination);

        if ($result) {
           $_POST['image'] = $image_name;
        } else {
            array_push($errors, "Failed to upload image");
        }
    } else {
       array_push($errors, "Post image required");
    }
    if (count($errors) == 0) {
        unset($_POST['add-post']);
        //Xrisomopoiontas to isset($_POST['add-post']) pernoume mono tis times title/image/body opote xriazete na baloume kai id kai published
        $_POST['user_id'] = $_SESSION['id'];
        $_POST['published'] = isset($_POST['published']) ? 1 : 0;
        $_POST['body'] = htmlentities($_POST['body']);
    
        $post_id = create($table, $_POST);
        $_SESSION['message'] = "Post created successfully";
        $_SESSION['type'] = "success";
        
        header("location: " . BASE_URL . "/admin/posts/index.php"); 
        exit();    
    } else {
        $title = $_POST['title'];
        $body = $_POST['body'];
        $topic_id = $_POST['topic_id'];
        $published = isset($_POST['published']) ? 1 : 0;
    }
}


if (isset($_POST['update-post'])) {
    adminOnly();
    $errors = validatePost($_POST);

    if (!empty($_FILES['image']['name'])) {
        $image_name = time() . '_' . $_FILES['image']['name'];
        $destination = ROOT_PATH . "/assets/images/" . $image_name;

        $result = move_uploaded_file($_FILES['image']['tmp_name'], $destination);

        if ($result) {
           $_POST['image'] = $image_name;
        } else {
            array_push($errors, "Failed to upload image");
        }
    } else {
       array_push($errors, "Post image required");
    }

    if (count($errors) == 0) {
        $id = $_POST['id'];
        unset($_POST['update-post'], $_POST['id']);
        $_POST['user_id'] = $_SESSION['id'];
        $_POST['published'] = isset($_POST['published']) ? 1 : 0;
        $_POST['body'] = htmlentities($_POST['body']);
    
        $post_id = update($table, $id, $_POST);
        $_SESSION['message'] = "Post updated successfully";
        $_SESSION['type'] = "success";
        header("location: " . BASE_URL . "/admin/posts/index.php");       
    } else {
        $title = $_POST['title'];
        $body = $_POST['body'];
        $topic_id = $_POST['topic_id'];
        $published = isset($_POST['published']) ? 1 : 0;
    }

}

and thats create.php

<?php include("../../path.php"); ?>
<?php include(ROOT_PATH . "/app/controllers/posts.php"); 
adminOnly();
?>
<!DOCTYPE html>
<html lang="en">

    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="ie=edge">

        <!-- Font Awesome -->
        <link rel="stylesheet"
            href="https://use.fontawesome.com/releases/v5.7.2/css/all.css"
            integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr"
            crossorigin="anonymous">

        <!-- Google Fonts Candal.ttf kai Lora.ttf -->
        <link href="https://fonts.googleapis.com/css?family=Candal|Lora"
            rel="stylesheet">

        <!-- CSS -->
        <link rel="stylesheet" href="../../assets/css/style.css">
        <link rel="stylesheet" href="../../assets/css/admin.css">

        <title>Admin Section - Add Post</title>
    </head>

    <body>
        
    <?php include(ROOT_PATH . "/app/includes/adminHeader.php"); ?>

        <!-- Admin Page Wrapper -->
        <div class="admin-wrapper">

        <?php include(ROOT_PATH . "/app/includes/adminSidebar.php"); ?>


            <!-- Admin Content -->
            <div class="admin-content">
                <div class="button-group">
                    <a href="create.php" class="btn btn-big">Add Post</a>
                    <a href="index.php" class="btn btn-big">Manage Posts</a>
                </div>


                <div class="content">

                    <h2 class="page-title">Add Post</h2>

                    <?php include(ROOT_PATH . '/app/helpers/formErrors.php'); ?>

                    <form action="create.php" method="post" enctype="multipart/form-data">
                        <div>
                            <label>Title</label>
                            <input type="text" name="title" value="<?php echo $title ?>" class="text-input">
                        </div>
                        <div>
                            <label>Body</label>
                            <textarea name="body" id="body"><?php echo $body ?></textarea>
                        </div>
                        <div>
                            <label>Image</label>
                            <input type="file" name="image" class="text-input">
                        </div>
                        <div>
                            <label>Topic</label>
                            <select name="topic_id" class="text-input">
                                <option value=""></option>
                                <?php foreach ($topics as $key => $topic): ?>
                                    <?php if (!empty($topic_id) && $topic_id == $topic['id'] ): // an o users exi epileksi sto parelthon kai to id einai to idio topic me auto sto loop tote emfanizi to selected topics ?> 
                                        <option selected value="<?php echo $topic['id'] ?>"><?php echo $topic['name'] ?></option>
                                    <?php else: ?>
                                        <option value="<?php echo $topic['id'] ?>"><?php echo $topic['name'] ?></option>
                                    <?php endif; ?>

                                <?php endforeach; ?>

                            </select>
                        </div>
                        <div>
                            <?php if (empty($published)): ?>
                                <label>
                                    <input type="checkbox" name="published">
                                    Publish
                                </label>
                            <?php else: ?>
                                <label>
                                    <input type="checkbox" name="published" checked>
                                    Publish
                                </label>
                            <?php endif; ?>
                           

                        </div>
                        <div>
                            <button type="submit" name="add-post" class="btn btn-big">Add Post</button>
                        </div>
                    </form>

                </div>

            </div>
            <!-- Admin Content -->

        </div>
        <!-- Page Wrapper -->



        <!-- JQuery -->
        <script
            src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
        <!-- Ckeditor -->
        <script
            src="https://cdn.ckeditor.com/ckeditor5/12.2.0/classic/ckeditor.js"></script>
        <!-- Java Script -->
        <script src="../../assets/js/scripts.js"></script>

    </body>

</html>

also that connect.php in case you guys need it

<?php

define("DB_SERVER", "localhost");
define("DB_USER", "root");
define("DB_PASSWORD", "");
define("DB_DATABASE", "movieworld");

$conn = mysqli_connect(DB_SERVER , DB_USER, DB_PASSWORD, DB_DATABASE);

if ($conn->connect_error) {
    die('Database connection error: ' . $conn->connect_error);
}
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