Question about inserting data into DB

[SocomNego]

Ok this is what I have for a registration form.....just the part for inserting it! Oh and just to let you know the error checking crap is above the array so don't worry about the "<?php" beginning tag.

PHP Code:

//put user data into an array
      $userdata = array('username' => $uname,
                      'password' => $pass,
                      'nickname' => $nickname,
                      'fname' => $fname,
                      'lname' => $lname,
                      'address' => $address,
                      'city' => $city,
                      'state' => $state,
                      'zip' => $zip,
                      'phone' => $phone,
                      'email' => $email,
                      'rookie' => $rookie);
                      
}

?>

    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
                    <div align="center"> 
                    <?php
                    // check to see if errors...if errors are > than 0 then report errors otherwise send registration data to db.
if(count($errors) > 0)    {
                foreach($errors as $error)    {
                    echo('<div style="color:red; font-weight:bold;">' . $error . '</div>');
                }
            }
elseif(count($errors) < 1)    {
    $add_user = mysql_query("Insert into users values ('".$userdata."')");
    if ($add_user)    {
         echo '<div style="color:blue; font-weight:bold;">Registration is complete</div>';
        }else    {
        echo '<div style="color:red; font-weight:bold;">Problem inserting info into the Database.</div>';
        }
    }
                    ?>

Now in the DB I have an ID which is the first field, and then I have a joindate which is the last field. For some reason when I hit submit (when there are no errors) I still get the Problem inserting info into the Database.

Any help would be greatly appreciated.
Thanks
-Kraig-