500 - Internal Server Error

Error: The controller for URI "/marka/oppo.html" is not callable: Expected method "index" on class "Bieticaret\Controller\MarkaController". Available methods: "detail".
File: /home/demobieticaret/public_html/vendor/symfony/http-kernel/Controller/ControllerResolver.php:88

Stack trace:
#0 /home/demobieticaret/public_html/vendor/symfony/http-kernel/HttpKernel.php(146): Symfony\Component\HttpKernel\Controller\ControllerResolver->getController()
#1 /home/demobieticaret/public_html/vendor/symfony/http-kernel/HttpKernel.php(75): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#2 /home/demobieticaret/public_html/app/Routes.php(54): Symfony\Component\HttpKernel\HttpKernel->handle()
#3 /home/demobieticaret/public_html/index.php(64): require_once('/home/demobieti...')
#4 {main}