I got the error below, reinstalled yeoman and angular-fullstack. The message disappeared last night and I was able to connect to my localhost, but came back again when I was trying to run grunt serve (yes I tried installing sass)
total 698ms/Users/nho/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:315:in
to_specs': Could not find 'sass' (>= 0) among 29 total gem(s) (Gem::LoadError) Checked in 'GEM_PATH=/Users/nho/.gem/ruby/2.2.0:/Users/nho/.rvm/rubies/ruby-2.2.1/lib/ruby/gems/2.2.0', execute
gem envfor more information from /Users/nho/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:324:in
to_spec' from /Users/nho/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:64:ingem' from /Users/nho/.rvm/gems/ruby-2.2.1/bin/sass:22:in
' from /Users/nho/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:ineval' from /Users/nho/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in
'