laravel5.1 Class api.router does not exist

config/app.php:
Dingo\Api\Provider\LaravelServiceProvider::class,
web show this error:
ReflectionException in Container.php line 741:
Class api.router does not exist

and，composer update is show Class api.router does not exist

I don't know what's wrong，Thanks in advance！

Start with config/app.php and reproduce the Class api.router does not exist error in the web request and during composer update. Inspect the reported failure at Container.php line 741; the issue is complete when both commands resolve api.router without the ReflectionException.

Written by the indexing model from the issue text.