laravel5.2 errors not show up in blade

I am trying solve this wired problem for hours,but still the errors message won't show up in template. I have make sure the web middleware (which contains StartSession and ShareErrorsFromSession) is wrapped all my route.

all routes inside the web middleware

validation goes like :

validation code

[blade code][3]

please help!

the validation is worked, but the errors vanished

via Xin