Invalid page number

If you don't specify a page number then the viewers try and get the page number off then end of the url.

Because you have two viewers on one page, they're both using that same page number. So when your url has a 5 on the end it tries to display record 5 and page 5 of the list.

Try hardcoding the List Viewer to always be on page 1 and show all records (or whatever you like) with these options:

# Change these List Viewer Options
$options['pageNum'] = '1';
$options['perPage'] = '9999';