Warning: mysql_fetch_array() expects parameter 1 to be resou

$query = ("SELECT * FROM tys_post ORDER BY tys_id DESC");
 $result = mysqli_query($dbc, $query)
    or die('Error querying database.');
    $rowok=mysql_fetch_array($result);
    ?>
   <input type="submit" name="submit" value="Postok Torlese" /><?php
  while ($row = mysqli_fetch_array($result)) {
    ?>
  <div id="post" class=" layout" >

    <div><table width="101%" height="11" border="0" class="table">
  <tr>

<td width="98%" height="5">
    <?php
    echo $row['tys_title'] ?> <hr></td>
    <td width="2%"><?php echo '<input id="g" type="checkbox"   value=" ' . $row['tys_id'] . '" name="todelete[]" />';  ?></td>
  </tr>
</table>
    </div>
    <p id="story">
    <?php echo $row['tys_story'] ?>
    </p>
    <hr>
     <div id="user">
   <?php echo  '-' .$row['tys_user'].'-';
   ?>
   </div>
   </div>
   <?php
   while ($row = $result['tys_title'])
   {
   $comm=("SELECT * FROM tys_comment ORDER BY tys_id DESC WHERE tys_titles='$row'");
   $comms=mysqli_query($dbc,$comms);
   while($rows=mysqli_fetch_array($comms))
   {
       echo $comms['tys_titles'];
   }
   }
   }