Fatal error: Uncaught Error: Undefined class constant 'MAJOR_VERSION' in /home/xa05dj8p/public_html/wp-content/plugins/cardinity-gateway-for-easy-digital-downloads/vendor/guzzlehttp/guzzle/src/Utils.php:116 Stack trace: #0 /home/xa05dj8p/public_html/wp-content/plugins/cardinity-gateway-for-easy-digital-downloads/vendor/guzzlehttp/guzzle/src/functions.php(71): GuzzleHttp\Utils::defaultUserAgent() #1 /home/xa05dj8p/public_html/wp-content/plugins/easyazon/vendor/guzzlehttp/guzzle/src/Client.php(194): GuzzleHttp\default_user_agent() #2 /home/xa05dj8p/public_html/wp-content/plugins/easyazon/vendor/guzzlehttp/guzzle/src/Client.php(75): GuzzleHttp\Client->configureDefaults(Array) #3 /home/xa05dj8p/public_html/wp-content/plugins/easyazon/lib/amazon.php(420): GuzzleHttp\Client->__construct() #4 /home/xa05dj8p/public_html/wp-content/plugins/easyazon/lib/amazon.php(351): easyazon_api_get_items(Array, 'US') #5 /home/xa05dj8p/public_html/wp-content/plugins/easyazon/components/performance/performance.php(73): easyazon_get_items(Array, in /home/xa05dj8p/public_html/wp-content/plugins/cardinity-gateway-for-easy-digital-downloads/vendor/guzzlehttp/guzzle/src/Utils.php on line 116