Fatal Error

I am getting a fatal error when attempting to add items to my cart. Using Chrome browser. Here is my error:

Fatal error: Uncaught exception ‘Exception’ with message ‘String could not be parsed as XML’ in /home/ftbll/public_html/wp-content/plugins/wp-spreadplugin/spreadplugin.php:493 Stack trace: #0 /home/ftbll/public_html/wp-content/plugins/wp-spreadplugin/spreadplugin.php(493): SimpleXMLElement->__construct(”) #1 /home/ftbll/public_html/wp-content/plugins/wp-spreadplugin/spreadplugin.php(167): WP_Spreadplugin->checkout(Array, Array) #2 [internal function]: WP_Spreadplugin->ScSpreadplugin(Array, ”, ‘spreadplugin’) #3 /home/ftbll/public_html/wp-includes/shortcodes.php(236): call_user_func(Array, Array, ”, ‘spreadplugin’) #4 [internal function]: do_shortcode_tag(Array) #5 /home/ftbll/public_html/wp-includes/shortcodes.php(151): preg_replace_callback(‘/\[(\[?)(embed|…’, ‘do_shortcode_ta…’, ‘[spreadplugin s…’) #6 [internal function]: do_shortcode(‘[spreadplugin s…’) #7 /home/ftbll/public_html/wp-includes/plugin.php(173): call_user_func_array(‘do_shortcode’, Array) #8 /home/ftbll/public_html/wp-includes/post-template.php( in /home/ftbll/public_html/wp-content/plugins/wp-spreadplugin/spreadplugin.php on line 493

Any suggestions anyone?

https://www.ads-software.com/extend/plugins/wp-spreadplugin/