TypeError: Argument 1 passed to craft\helpers\UrlHelper::siteUrl() must be of the type string, null given, called in /Users/***username***/Sites/****-dev/vendor/craftcms/commerce-omnipay/src/base/Gateway.php on line 502 and defined in /Users/***username***/Sites/****-dev/vendor/craftcms/cms/src/helpers/UrlHelper.php:222
Stack trace:
#0 /Users/***username***/Sites/****-dev/vendor/craftcms/commerce-omnipay/src/base/Gateway.php(502): craft\helpers\UrlHelper::siteUrl(NULL)
#1 /Users/***username***/Sites/****-dev/vendor/craftcms/commerce-omnipay/src/base/Gateway.php(565): craft\commerce\omnipay\base\Gateway->createPaymentRequest(Object(craft\commerce\models\Transaction), Object(Omnipay\Common\CreditCard), NULL)
#2 /Users/***username***/Sites/****-dev/vendor/craftcms/commerce-omnipay/src/base/Gateway.php(357): craft\commerce\omnipay\base\Gateway->createRequest(Object(craft\commerce\models\Transaction), Object(craft\commerce\models\payments\OffsitePaymentForm))
#3 /Users/***username***/Sites/****-dev/vendor/craftcms/commerce/src/services/Payments.php(221): craft\commerce\omnipay\base\Gateway->purchase(Object(craft\commerce\models\Transaction), Object(craft\commerce\models\payments\OffsitePaymentForm))
#4 /Users/***username***/Sites/****-dev/vendor/craftcms/commerce/src/controllers/PaymentsController.php(287): craft\commerce\services\Payments->processPayment(Object(craft\commerce\elements\Order), Object(craft\commerce\models\payments\OffsitePaymentForm), '', Object(craft\commerce\models\Transaction))
#5 [internal function]: craft\commerce\controllers\PaymentsController->actionPay()
#6 /Users/***username***/Sites/****-dev/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)
#7 /Users/***username***/Sites/****-dev/vendor/yiisoft/yii2/base/Controller.php(157): yii\base\InlineAction->runWithParams(Array)
#8 /Users/***username***/Sites/****-dev/vendor/craftcms/cms/src/web/Controller.php(109): yii\base\Controller->runAction('pay', Array)
#9 /Users/***username***/Sites/****-dev/vendor/yiisoft/yii2/base/Module.php(528): craft\web\Controller->runAction('pay', Array)
#10 /Users/***username***/Sites/****-dev/vendor/craftcms/cms/src/web/Application.php(297): yii\base\Module->runAction('commerce/paymen...', Array)
#11 /Users/***username***/Sites/****-dev/vendor/craftcms/cms/src/web/Application.php(561): craft\web\Application->runAction('commerce/paymen...', Array)
#12 /Users/***username***/Sites/****-dev/vendor/craftcms/cms/src/web/Application.php(281): craft\web\Application->_processActionRequest(Object(craft\web\Request))
#13 /Users/***username***/Sites/****-dev/vendor/yiisoft/yii2/base/Application.php(386): craft\web\Application->handleRequest(Object(craft\web\Request))
#14 /Users/***username***/Sites/****-dev/web/index.php(21): yii\base\Application->run()
#15 {main}