Unhandled Error!

 
			$key = $this->fix_key($key);
			$dest_path = $this->dir_path.'/'.$key;
 
			$fp = @fopen($dest_path, 'w');
			if (!$fp)
				throw new Phpr_SystemException('Error writing to the cache file');
 
			try
			{
				if (flock($fp, LOCK_EX | LOCK_NB))
				{
					@fwrite($fp, $value);