Call to undefined function GuzzleHttp\choose_handler()

Fatal error: Uncaught Error: Call to undefined function GuzzleHttp\choose_handler() in C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\kkiapay-woocommerce\vendor\guzzlehttp\guzzle\src\HandlerStack.php:40 Stack trace: #0 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\kkiapay-woocommerce\vendor\guzzlehttp\guzzle\src\Client.php(65): GuzzleHttp\HandlerStack::create() #1 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\kkiapay-woocommerce\vendor\kkiapay\kkiapay-php\src\Kkiapay.php(39): GuzzleHttp\Client->__construct() #2 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\kkiapay-woocommerce\includes\class-wc-kkiapay-gateway.php(104): Kkiapay\Kkiapay->__construct(”, ”, ”, false) #3 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\kkiapay-woocommerce\includes\class-wc-kkiapay-gateway.php(55): WC_Kkiapay_Gateway->import_kkiapay() #4 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\woocommerce\includes\class-wc-payment-gateways.php(97): WC_Kkiapay_Gateway->__construct() #5 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\woocommerce\includes\class-wc-payment-gateways.php(70): WC_Payment_Gateways->init() #6 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\woocommerce\includes\class-wc-payment-gateways.php(43): WC_Payment_Gateways->__construct() #7 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\woocommerce\includes\class-woocommerce.php(883): WC_Payment_Gateways::instance() #8 C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\woocommerce\includes\admin\class-wc-admin-menus.php(93): WooCommerce->payment_gateways() #9 C:\xampp\htdocs\glorieuxPlus1\wp-includes\class-wp-hook.php(303): WC_Admin_Menus->settings_page_init(”) #10 C:\xampp\htdocs\glorieuxPlus1\wp-includes\class-wp-hook.php(327): WP_Hook->apply_filters(”, Array) #11 C:\xampp\htdocs\glorieuxPlus1\wp-includes\plugin.php(470): WP_Hook->do_action(Array) #12 C:\xampp\htdocs\glorieuxPlus1\wp-admin\admin.php(237): do_action(‘load-woocommerc…’) #13 {main} thrown in C:\xampp\htdocs\glorieuxPlus1\wp-content\plugins\kkiapay-woocommerce\vendor\guzzlehttp\guzzle\src\HandlerStack.php on line 40