I keep receiving this error when i try and use any shopping plugin..

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/content/23/7019123/html/wp-content/plugins/wp-e-commerce/wpsc-core/wpsc-functions.php on line 510

Fatal error: Call to undefined function get_queried_object() in /home/content/23/7019123/html/wp-content/plugins/wp-e-commerce/wpsc-includes/theme.functions.php on line 1093

any ideas what the problem might be?

Thanks

Tom

try disabling all your other plugins
if that doesn't help, contact the plugin developer