Dear, Can you advise on the following error messages that

Dear,
Can you advise on the following error messages that appear on subsite only not on mainsite. Attached also a screenshot.

Example this subsite.
http://www.pixshopping.com/4m4progettazionistore/

Error messages:
Notice: Undefined variable: warning in /web/htdocs/www.pixshopping.com/home/wp-content/plugins/buddypress-wall/loader.php on line 138

Notice: Undefined offset: 0 in /web/htdocs/www.pixshopping.com/home/wp-includes/plugin.php on line 925

Notice: Undefined offset: 0 in /web/htdocs/www.pixshopping.com/home/wp-includes/plugin.php on line 943

Notice: Trying to get property of non-object in /web/htdocs/www.pixshopping.com/home/wp-content/plugins/photo-gallery/photo-gallery.php on line 2197

Notice: Trying to get property of non-object in /web/htdocs/www.pixshopping.com/home/wp-content/plugins/photo-gallery/photo-gallery.php on line 2203

Notice: Undefined index: google_map_domain in /web/htdocs/www.pixshopping.com/home/wp-content/plugins/store-locator/sl-functions.php on line 492

Notice: Undefined index: theme in /web/htdocs/www.pixshopping.com/home/wp-content/plugins/store-locator/sl-functions.php on line 516

Thanks for a quick reply.
Paddy