Mysidia Adoptables Support Forum - Error When Using Item

Here you go(not I may have customized a thing or two in there):
PHP Code:

		
			
<?php

class InventoryController extends AppController{

    const PARAM = "confirm";
    private $view;
    private $subController;

    public function __construct(){
        parent::__construct("member");
    }
    
    public function index(){
        $mysidia = Registry::get("mysidia");
        $document = $mysidia->frame->getDocument();
        $document->setTitle($mysidia->lang->inventory);
        
        $inventory = new Inventory($mysidia->user);
        if($inventory->gettotal() == 0) throw new InvalidIDException($mysidia->lang->inventory_empty);
        $inventory->display();
    }
            
    public function uses(){
        $mysidia = Registry::get("mysidia");
        $document = $mysidia->frame->getDocument();
        $item = new PrivateItem($mysidia->input->post("itemname"), $mysidia->user->username);   
        if($item->iid == 0) throw new InvalidIDException("It appears that you do not have this item in your inventory.");
        
        if($mysidia->input->post("aid")){
            if(!$item->checktarget($mysidia->input->post("aid")) or $mysidia->input->post("validation") != "valid"){
                $document->setTitle($mysidia->lang->use_title);
                $document->addLangvar($mysidia->lang->use_fail);
            }
            elseif(!$item->randomchance()){
                $item->remove();
                $document->setTitle($mysidia->lang->badluck);
                $document->addLangvar($mysidia->lang->effect);
            }
            else $item->apply($mysidia->input->post("aid")); 
            return;            
        }
        
        $document->setTitle($mysidia->lang->select_title);
        $document->addLangvar($mysidia->lang->select);
        
        $chooseFrom = new Form("chooseform", "uses", "post");
        $adoptable = new DropdownList("aid");
        
        $ids = $mysidia->db->select("owned_adoptables", array("aid"), "owner = '{$mysidia->user->username}'")->fetchAll(PDO::FETCH_COLUMN);    
        $names = $mysidia->db->select("owned_adoptables", array("name"), "owner = '{$mysidia->user->username}'")->fetchAll(PDO::FETCH_COLUMN);
        $adoptable->add(new Option("None Selected", "none"));
        $adoptable->fill($names, $ids);
        
        $chooseFrom->add($adoptable);
        $chooseFrom->add(new PasswordField("hidden", "itemname", $mysidia->input->post("itemname")));
        $chooseFrom->add(new PasswordField("hidden", "validation", "valid"));
        $chooseFrom->add(new Button("Choose this Adopt", "submit", "submit"));
        $document->add($chooseFrom);
    }
    
    public function sell(){
        $mysidia = Registry::get("mysidia");
        $document = $mysidia->frame->getDocument();
        $item = new PrivateItem($mysidia->input->post("itemname"), $mysidia->user->username);   
        if($item->iid == 0) throw new InvalidIDException("It appears that you do not have this item in your inventory.");
        
        if(!$mysidia->input->post("quantity")){
            $document->setTitle($mysidia->lang->global_action_title);
            $document->addLangvar($mysidia->lang->sell_empty);
        }
        elseif($item->quantity < $mysidia->input->post("quantity")){
            $document->setTitle($mysidia->lang->global_action_title);
            $document->addLangvar($mysidia->lang->sell_quantity);
        }
        else{
            $item->sell($mysidia->input->post("quantity"));
            $document->setTitle("Transaction Completed");
            $document->addLangvar("{$mysidia->lang->sell}{$mysidia->input->post("quantity")} {$mysidia->input->post("itemname")} {$mysidia->lang->sell2}");
        }    
    }
    
    public function toss(){
        $mysidia = Registry::get("mysidia");
        $document = $mysidia->frame->getDocument();
        $item = new PrivateItem($mysidia->input->post("itemname"), $mysidia->user->username);  
        if($item->iid == 0) throw new InvalidIDException("It appears that you do not have this item in your inventory.");
        
        if($mysidia->input->get("confirm")){
            $item->toss();
            $document->setTitle($mysidia->lang->global_action_complete);
            $document->addLangvar($mysidia->lang->toss.$mysidia->input->post("itemname").$mysidia->lang->toss2);
            return;
        }
        
        $warning = "Are you sure you wish to toss {$mysidia->input->post("itemname")}?<br> 
                    It will be permanently removed from your inventory, and this action cannot be undone!<br>";
        $document->setTitle("Confirm your Action");
        $document->add(new Comment($warning));    

        $confirmForm = new FormBuilder("confirmform", "toss/confirm", "post");
        $confirmForm->buildPasswordField("hidden", "action", "toss")
                    ->buildPasswordField("hidden", "itemname", $mysidia->input->post("itemname"))
                    ->buildButton("Please Toss", "confirm", "confirm");
        $document->add($confirmForm);            
    }
}
?>
@Annatar
That would be horrible! You have a lot of custom stuff there no?