I am getting the below error once I installed the Sitecore JSS server packages Preview 4. I have follwed the same steps mentioned in https://jss.sitecore.net/docs/getting-started/jss-server-install
The controller for path '/sitecore/api/layout/render/jss' was not found or does not implement IController.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: Sitecore.Mvc.Diagnostics.ExceptionWrapper: The controller for path '/sitecore/api/layout/render/jss' was not found or does not implement IController.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[ExceptionWrapper: The controller for path '/sitecore/api/layout/render/jss' was not found or does not implement IController.]
[ControllerCreationException: Could not create controller: 'LayoutService'. The context item is: '/sitecore/content/Careers/Home'. The current route url is: 'sitecore/api/layout/{action}/{configuration}'. ]
Sitecore.Mvc.Controllers.SitecoreControllerFactory.CreateController(RequestContext requestContext, String controllerName) +172
System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +268 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +95
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +923 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +157