Warning: Cannot bind an instance to a static closure in /app/vendor/slim/slim/Slim/CallableResolver.php on line 177

Fatal error: Uncaught TypeError: Slim\CallableResolver::bindToContainer(): Return value must be of type callable, null returned in /app/vendor/slim/slim/Slim/CallableResolver.php:179 Stack trace: #0 /app/vendor/slim/slim/Slim/CallableResolver.php(90): Slim\CallableResolver->bindToContainer(NULL) #1 /app/vendor/slim/slim/Slim/CallableResolver.php(70): Slim\CallableResolver->resolveByPredicate(Object(Closure), Array, 'handle') #2 /app/vendor/slim/slim/Slim/Routing/RouteGroup.php(63): Slim\CallableResolver->resolveRoute(Object(Closure)) #3 /app/vendor/slim/slim/Slim/Routing/RouteCollector.php(236): Slim\Routing\RouteGroup->collectRoutes() #4 /app/vendor/slim/slim/Slim/Routing/RouteCollectorProxy.php(179): Slim\Routing\RouteCollector->group('/api/v1', Object(Closure)) #5 /app/src/routes.php(22): Slim\Routing\RouteCollectorProxy->group('/api/v1', Object(Closure)) #6 /app/public/index.php(16): {closure}(Object(Slim\App)) #7 {main} thrown in /app/vendor/slim/slim/Slim/CallableResolver.php on line 179