raise error in `fetching from https://rubygems.org/` when bundle install

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recently, i get error when i implement `bundle install` in fetching from `https://rubygems.org/` like below : 

`

Fetching gem metadata from https://rubygems.org/.Retrying dependency api due to error (2/4): Bundler::HTTPError Net::HTTPInternalServerError: <h1>Internal Server Error</h1>

Retrying dependency api due to error (3/4): Bundler::HTTPError Net::HTTPInternalServerError: <h1>Internal Server Error</h1>

Retrying dependency api due to error (4/4): Bundler::HTTPError Net::HTTPInternalServerError: <h1>Internal Server Error</h1>

`

i think this error was caused by `jpmobile`

so i comment out `gem 'jpmobile'` in `Gemfile`, it's ok

but i get error `undefined method 'smart_phone?'` when i run `rspec`

I'm so sorry because i can't speak Japanese 

i need your help

thanks

[Tài Trí Võ]