ruby on rails - Uninitialized constant ActionDispatch::Routing::Mapper::Scope (name Error) -

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i'm trying debug error.

@scope = actiondispatch::routing::mapper::scope.new(       path:         "",       shallow_path: "",       constraints:  {},       defaults:     {},       options:      {},       parent:       nil     )

but receive error:

nameerror: uninitialized constant actiondispatch::routing::mapper::scope

any idea?

i'm using rails 4.1.6

actiondispatch::routing::mapper::scoping

http://api.rubyonrails.org/classes/actiondispatch/routing/mapper/scoping.html


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