Railties installed but throws error on port binding with rails s -b -


i'm attempting access locally hosted rails app via smartphone, , wanted bind rails server new port using 

rails s -b 0.0.0.0 -p 80

however, when do, following error thrown:

/users/alex/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/dependency.rb:319:in `to_specs': not find 'railties' (>= 0.a) among 16 total gem(s) (gem::loaderror)

i using rvm @ moment, , running ls `rvm gemdir` gems gives me:

... rails-html-sanitizer-1.0.3 rails4-autocomplete-1.1.1 railties-4.2.6 rake-11.2.2 rdoc-4.2.2 ...

i'm puzzled why railties found other dependent things in gemset, except in 1 case.


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