Six Pack Abs On Amazon.com

Fatal error: Uncaught Error: Call to undefined method WP_Error::get_item_quantity() in /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-content/plugins/amazon-product-feeder/amazon-product-feeder.php:76 Stack trace: #0 /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-includes/shortcodes.php(319): SLB_Amazon_Product_Feeder(Array, '', 'apf') #1 [internal function]: do_shortcode_tag(Array) #2 /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-includes/shortcodes.php(197): preg_replace_callback('/\\[(\\[?)(apf)(?...', 'do_shortcode_ta...', '[apf http://wei...') #3 /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-includes/class-wp-hook.php(286): do_shortcode('[apf http://wei...') #4 /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-includes/plugin.php(203): WP_Hook->apply_filters('[apf http://wei...', Array) #5 /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-includes/post-template. in /customers/d/f/8/fatlosswithease.com/httpd.www/thetruthaboutsixpackabs/wp-content/plugins/amazon-product-feeder/amazon-product-feeder.php on line 76