Getting name of random item

[Dinocanid]

Since I got error messages back, I was able to find this as the error:

Catchable fatal error: Method StockItem::__toString() must return a string value in /home/adopttes/public_html/view/treasureview.php on line 103

I tried using this like strval and (string) but that didn't work.

EDIT: I was able to fix it! I had to use this to get the name of the item:

$ni1_name = $newitem1->itemname;
$document->add(new Comment("Congratulations! You earned a {$ni1_name} !"));