ERROR
Call to a member function markInterestInTraining() on null#0 /var/latin-passion-fullstack-production/legacy-php/src/modules/slimrouting.php(223): require_once()
#1 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(38): {closure}()
#2 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/Routing/Route.php(358): Slim\Handlers\Strategies\RequestResponse->__invoke()
#3 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Slim\Routing\Route->handle()
#4 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Slim\MiddlewareDispatcher->handle()
#5 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/Routing/Route.php(315): Slim\MiddlewareDispatcher->handle()
#6 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/Routing/RouteRunner.php(68): Slim\Routing\Route->run()
#7 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/Middleware/RoutingMiddleware.php(45): Slim\Routing\RouteRunner->handle()
#8 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/MiddlewareDispatcher.php(121): Slim\Middleware\RoutingMiddleware->process()
#9 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/Middleware/ErrorMiddleware.php(76): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#10 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/MiddlewareDispatcher.php(121): Slim\Middleware\ErrorMiddleware->process()
#11 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/MiddlewareDispatcher.php(65): Psr\Http\Server\RequestHandlerInterface@anonymous->handle()
#12 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/App.php(199): Slim\MiddlewareDispatcher->handle()
#13 /var/latin-passion-fullstack-production/legacy-php/vendor/slim/slim/Slim/App.php(183): Slim\App->handle()
#14 /var/latin-passion-fullstack-production/legacy-php/src/modules/slimrouting.php(1285): Slim\App->run()
#15 /var/latin-passion-fullstack-production/legacy-php/public/index.php(226): require_once('...')
#16 {main}