Error en php

[felcorp]

Buenas tardes, me gustaria que me ayudaran con este error.

Fatal error: main() [<a href='function.main'>function.main</a>]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition &quot;cls&quot; of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in C:\AppServ\www\yupeephone\consulta.php on line 31

donde tengo estos archivos.

consulta.php

Código PHP:

<?php
session_start();
require_once('conexion.php');
require_once('cls.php');
    if (!isset($_SESSION["coupons"])){ 
    $_SESSION["coupons"] = new cls();
    
    }   
//tablas  
 $conexion = new conexion();
     
     if($conexion->abre_conexion() == 1)
    { 
    
    $campania=$_SESSION['campania'];
    
    $v_clic_coupons = mysql_query("select distinct 
    `tblhosting`.`domain` AS `domain`,
    `tblproducts`.`name` AS `productname`,
    `tblhosting`.`userid` AS `userid`,
    `coupons`.`active` AS `active`,
    `tblhosting`.`id` AS `idhosting`,
    `detailscoupons`.`id` AS `iddetailscoupons`,
    `detailstypecoupons`.`description` AS `description` 
   from 
    (((((`tblproducts` join `tblhosting` on((`tblproducts`.`id` = `tblhosting`.`packageid`))) join `detailscoupons` on((`detailscoupons`.`idproducts` = `tblproducts`.`id`))) join `detailstypecoupons` on((`detailscoupons`.`iddetailstypecoupons` = `detailstypecoupons`.`id`))) join `typecoupons` on((`typecoupons`.`id` = `detailstypecoupons`.`idtypecoupons`))) join `coupons` on((`detailscoupons`.`id` = `coupons`.`iddetailscoupons`))) 
  where tblhosting.userid='".$_SESSION['iduser']."' and tblhosting.domainstatus='Active' and typecoupons.name='".$campania."' group by tblhosting.id;"); 
 
    while ($registroclic = mysql_fetch_array($v_clic_coupons))
     { 
        $_SESSION["coupons"]->introduce($registroclic[productname],$registroclic[domain],$registroclic[description],"<a style=\"text-decoration:underline;cursor:pointer;\"onclick=\"enviarDatos($registroclic[userid],$registroclic[idhosting],$registroclic[iddetailscoupons])\">Activar</a>"); 
                
    }//Fin del while
    
    $_SESSION["coupons"]->imprime();
    
    }//fin del if
 
    $conexion->cierra_conexion(); 
?>
 

y cls.php
<?php
session_start();

Código PHP:

class cls { 
 
     var $array_productname; 
     var $array_domain; 
     var $array_description; 
     var $array_active;  
     var $num;
     
    function __construct () 
    { 
      $this->num=0; 
    }  
    
    function cls ()
    {
       $this->num=0; 
    }
    
    function introduce($prod,$domain,$descrip,$active){ 
    
       $this->array_productname[$this->num]=$prod; 
       $this->array_domain[$this->num]=$domain; 
       $this->array_description[$this->num]=$descrip; 
       $thia->array_active[$this->num]=$active;   
       $this->num++;
      }
 
    function imprime(){ 
 
    for ($i=0;$i<$this->num;$i++)
    {
        if($this->array_productname[$i]!=0)
        {
        $nada=1;
        echo '<TD>' . $this->array_productname[$i].'<br>'.$this->array_domain[$i]. '</TD> '  ; //
        echo '<TD > &nbsp;</TD> '  ; //
        echo '<TD>' . $this->array_description[$i].'</TD> '  ; //
        echo '<td>'.$this->array_active[$i].'</td>';
        echo $this->num;
        }
    }
        echo "</TR>";
        
       if($nada== 0)
        {
        echo "<tr align='center' valign='middle'><td colspan='8'>Sin resultados</td></tr>";
        }
 
    } 
    
    function elimina($linea){ 
       $this->array_productname[$linea]=0; 
    } 
    
    function retorna_total()
    {
       return $this->num;
    }
 
}
?>
 

Muchas gracias de antemano, y que tengan buen dia.