Getting a PHP Error in Pro Sites with Stripe

Hi, I am getting a PHP Error in Pro Sites when I try to enable the Stripe Payment Gateway:

Warning: array_merge(): Argument #2 is not an array in /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSites/Model/Gateways.php on line 39

Also, when I go to the page (Befor clicking Enable) There is this error at the bottom:

Fatal error: Uncaught exception 'Exception' with message 'Stripe needs the Multibyte String PHP extension.' in /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe.php:13 Stack trace: #0 /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe.php(25): require_once() #1 /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSites/View/Gateways.php(193): ProSites_Gateway_Stripe->__construct() #2 [internal function]: ProSites_View_Gateways::render_tab_stripe() #3 /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSites/Helper/Tabs.php(88): call_user_func(Array) #4 /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSites/Helper/Tabs/Gateways.php(27): ProSites_Helper_Tabs::render_child('ProSites_Helper...', 'ProSites_View_G...', Array, Array, Array) #5 /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/lib/ProSi in /home/standardweb/public_html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe.php on line 13