With my experience with Flarum I've encountered many errors I've been able to over come. This one however I cannot..
Fatal error: Uncaught exception 'FastRoute\BadRouteException' with message 'Cannot register two routes matching "/admin-mail" for method "POST"' in C:\xampp\htdocs\forums\vendor\nikic\fast-route\src\DataGenerator\RegexBasedAbstract.php:55 Stack trace: #0 C:\xampp\htdocs\forums\vendor\nikic\fast-route\src\DataGenerator\RegexBasedAbstract.php(18): FastRoute\DataGenerator\RegexBasedAbstract->addStaticRoute('POST', Array, Object(Flarum\Http\Handler\ControllerRouteHandler)) #1 C:\xampp\htdocs\forums\vendor\flarum\core\src\Http\RouteCollection.php(70): FastRoute\DataGenerator\RegexBasedAbstract->addRoute('POST', Array, Object(Flarum\Http\Handler\ControllerRouteHandler)) #2 C:\xampp\htdocs\forums\vendor\flarum\core\src\Http\RouteCollection.php(47): Flarum\Http\RouteCollection->addRoute('POST', '/admin-mail', 'avatar4eg.users...', Object(Flarum\Http\Handler\ControllerRouteHandler)) #3 C:\xampp\htdocs\forums\vendor\flarum\core\src\Event\AbstractConfigureRoutes.php(87): Flarum\Http\RouteCollection->post('/admin-mail', 'avatar4eg.us in C:\xampp\htdocs\forums\vendor\nikic\fast-route\src\DataGenerator\RegexBasedAbstract.php on line 55