Fatal error: Uncaught exception 'Symfony\Component\Routing\Exception\InvalidParameterException' with message 'Parameter "flag_id" for route "rmcgirr83_nationalflags_getflags" must match "[^/]++" ("" given) to generate a corresponding URL.' in /opt/lampp/htdocs/forum/vendor/symfony/routing/Symfony/Component/Routing/Generator/UrlGenerator.php:163 Stack trace: #0 /opt/lampp/htdocs/forum/vendor/symfony/routing/Symfony/Component/Routing/Generator/UrlGenerator.php(136): Symfony\Component\Routing\Generator\UrlGenerator->doGenerate(Array, Array, Array, Array, Array, 'rmcgirr83_natio...', false, Array) #1 /opt/lampp/htdocs/forum/phpbb/controller/helper.php(188): Symfony\Component\Routing\Generator\UrlGenerator->generate('rmcgirr83_natio...', Array, false) #2 /opt/lampp/htdocs/forum/ext/rmcgirr83/nationalflags/core/nationalflags.php(202): phpbb\controller\helper->route('rmcgirr83_natio...', Array) #3 /opt/lampp/htdocs/forum/ext/rmcgirr83/nationalflags/event/listener.php(167): rmcgirr83\nationalflags\core\nationalflags->top_flags() in /opt/lampp/htdocs/forum/vendor/symfony/routing/Symfony/Component/Routing/Generator/UrlGenerator.php on line 163