doctrine2/lib/Doctrine/ORM/Query/QueryException.php

<?php
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namespace Doctrine\ORM\Query;

/**
 * Description of QueryException
 *
 * @author robo
 */
class QueryException extends \Doctrine\Common\DoctrineException
{
    public static function nonUniqueResult()
    {
        return new self("The query contains more than one result.");   
    }
}