install generator fails in rails 4.1

[KarlGl]

When trying to run the install generator I get the following error about formtastic:

/Users/kg/.rvm/gems/ruby-2.1.2/gems/surveyor-0.20.0/lib/formtastic/surveyor_builder.rb:3:in <module:Formtastic>': uninitialized constant Formtastic::SemanticFormBuilder (NameError) from /Users/kg/.rvm/gems/ruby-2.1.2/gems/surveyor-0.20.0/lib/formtastic/surveyor_builder.rb:2:in<top (required)>'
from /Users/kg/.rvm/gems/ruby-2.1.2/gems/surveyor-0.20.0/lib/surveyor.rb:3:in `require'

[francescob]

put
gem 'surveyor', :github => "NUBIC/surveyor", :branch => "master"

in your gem file

[taiwoayanleye]

Did same
gem 'surveyor', :git => 'git://github.com/NUBIC/surveyor.git', :branch => 'simple_form'