ruby on rails - rake db:reset throws error -

i'm following napa api framework tutorial on how create apis. on running rake db:reset raising following error

warn: unresolved specs during gem::specification.reset:   minitest (~> 4.2) warn: clearing out unresolved specs. please report bug if causes problems. rake aborted! nameerror: uninitialized constant virtus::configuration::coercible /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/virtus-1.0.5/lib/virtus/configuration.rb:40:in `initialize' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/virtus-1.0.5/lib/virtus/builder.rb:28:in `new' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/virtus-1.0.5/lib/virtus/builder.rb:28:in `call' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/virtus-1.0.5/lib/virtus.rb:152:in `model' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/representable-1.8.5/lib/representable/coercion.rb:5:in `<class:coercer>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/representable-1.8.5/lib/representable/coercion.rb:4:in `<module:coercion>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/representable-1.8.5/lib/representable/coercion.rb:3:in `<top (required)>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/roar-0.12.9/lib/roar/representer/feature/coercion.rb:2:in `require' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/roar-0.12.9/lib/roar/representer/feature/coercion.rb:2:in `<top (required)>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/napa-0.4.3/lib/napa/output_formatters/representer.rb:3:in `require' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/napa-0.4.3/lib/napa/output_formatters/representer.rb:3:in `<top (required)>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/napa-0.4.3/lib/napa.rb:27:in `require' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/napa-0.4.3/lib/napa.rb:27:in `<top (required)>' /home/jay/appservice/app.rb:6:in `require' /home/jay/appservice/app.rb:6:in `<top (required)>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:126:in `require' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:126:in `require' /home/jay/appservice/rakefile:6:in `<top (required)>' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/rake_module.rb:28:in `load' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/rake_module.rb:28:in `load_rakefile' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:689:in `raw_load_rakefile' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:94:in `block in load_rakefile' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:93:in `load_rakefile' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:77:in `block in run' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:75:in `run' /home/jay/.rbenv/versions/2.0.0-p576/lib/ruby/gems/2.0.0/gems/rake-10.4.2/bin/rake:33:in `<top (required)>' /home/jay/.rbenv/versions/2.0.0-p576/bin/rake:23:in `load' /home/jay/.rbenv/versions/2.0.0-p576/bin/rake:23:in `<main>' 

any appreciated.

a year later running similar issue. i've resolved it. while trying run through napa quickstart on mac os el capitan noticed pulling napa 0.5.1 not compatible. first thing did change napa 0.5.0.

the next thing change active-record 4.2.0 4.0.0 got rid of minitest gem issue.

i hope helps visiting napa first time , can't quicstart work.

also, tried quickstart mysql , not postgres tutorial uses.