issues with `rake routes`

Created by: astamm78

Half the time when I run my rake routes command I get the following error:

RailsApp/config/routes.rb:26:in `block (2 levels) in <top (required)>': uninitialized constant DashboardManifest (NameError)

Other times my routes print correctly to the console, but there's no listing for my admin namespaced routes.

I've seen the uninitialized constant DashboardManifest (NameError) error pop up randomly when using generators as well, but the error doesn't seem to appear consistently.