(ArrayOfBooks) Book:
(ArrayOfBooks) Book:
(Book) Released:
(ArrayOfBooks) Book:
(ArrayOfBooks) Book:
(ArrayOfBooks) Book:
Can't call method "tag" on an undefined value at monk_twig_xml_leaf2.pl line 11.

 at monk_twig_xml_leaf2.pl line 19.
 at monk_twig_xml_leaf2.pl line 19.