ช่วยดูให้หน่อยครับมันบอกว่า error array ครับๆๆๆๆๆๆๆๆๆๆๆๆ

<?php
if(isset($_POST['submit'])){
    $db = new mysqli('localhost', 'root', '1234', 'social') or die('error');
    
    $fname = $_POST['fname'];
    $lname = $_POST['lname'];
    $username = $_POST['username'];
    $password = $_POST['password'];
    $email = $_POST['email'];
    
    $userCheck = $db->query("SELECT social FROM account WHERE username='".$username."'");
    if(empty($fname) || empty($lname) || empty($username) || empty($password) || empty($email)){
        if(empty($fname)){
            $errors[] = "Miss Fname";
        }
        if(empty($lname)){
            $errors[] = "Miss Lname";
        }
        if(empty($username)){
            $errors[] = "Miss Username";
        }
        if(empty($password)){
            $errors[] = "Miss Password";
        }
        if(empty($email)){
            $errors[] = "Miss Email";
        }
    }else if(!filter_var($email, FILTER_VALIDATE_EMAIL)){
        $errors[] = "Not a caild email";
    }else if($username == $password){
        $errors[] = "Username & password can't match";
    }else if($userCheck->num_rows>0){
        $errors = "username is already in use";
    }else{
        $fname = strip_tags($fname);
        $fname = stripcslashes($fname);
        $fname = trim($fname);
        
        $lname = strip_tags($lname);
        $lname = stripcslashes($lname);
        $lname = trim($lname);
        
        $username = strip_tags($username);
        $username = stripcslashes($username);
        $username = trim($username);
        
        $password = strip_tags($password);
        $password = stripcslashes($password);
        $password = trim($password);
        $password = md5($password);
        
        $email = strip_tags($email);
        $email = stripcslashes($email);
        $email = trim($email);
        
        $sql = "INSERT INTO account (firs_name, last_name, username, password, email) VALUES(?,?,?,?,?)";
        if($query = $db->prepare($sql)){
            $query->bind_param($fname,$lname,$username,$password,$email);
            $query->execute();
            $msg = "Your account has been created";
        }else{
            $errors[] = "Sorry error with database at this time";
        }
    }
}
?>