WP .osC using atahualpa template

I am very happy with how smoothly Atahualpa is working for my wordpress 2.7.1 blog. I am installing a wordpress store using the WP .osC plugin (very cool by the way), but it seems that the Atahualpa theme will not apply to the template. I get this error message after I set it to the Atahualpa theme:

Warning: Invalid argument supplied for foreach() in /homepages/9/d200890229/htdocs/endeavourz/store/catalog/themes/atahualpa/index.php on line 3

Fatal error: Call to undefined function: is_page() in /homepages/9/d200890229/htdocs/endeavourz/store/catalog/themes/atahualpa/index.php on line 10

Here are the first few lines of my index.php file:

<?php
global $options;
foreach ($options as $value) {
	if (get_option( $value['id'] ) === FALSE) {
		$$value['id'] = $value['std'];
	} else {
		$$value['id'] = get_option( $value['id'] );
	}
}
if ( is_page() ) { global $wp_query; $current_page_id = $wp_query->get_queried_object_id(); }
?>
<?php get_header(); ?>
<?php // If there are any posts:
if (have_posts()) : $postcount == 0; ?>
<?php if( is_archive() AND function_exists('page2cat_output')) { page2cat_output($cat); } // This is for the plugin Page2Cat https://www.ads-software.com/extend/plugins/page2cat/ ?>

Thanks for your help!