Session state is not available in this context.

[mrvithan]

I try to integrate the Line Bot system to a framework (http://www.aspnetboilerplate). But when i try the web hook function i got this error

System.Reflection.TargetInvocationException: Property accessor 'Session' on object 'ASP.global_asax' threw the following exception:'Session state is not available in this context.' ---> System.Web.HttpException: Session state is not available in this context.
at System.Web.HttpApplication.get_Session()

Any suggestion ?