fix to "Internal Server Error" 

fix to "Internal Server Error
Can`t locate object method "new" via package "Dancer2::Handler::File" (perhaps you forgot to load "Dancer2::Handler::File"?) at.. Dancer2/Core/App.pm  in  sub send_file arround my $file_handler = Dancer2::Handler::File->new" when issued a send_file with route_handlers: {} in config.yml