Rspec fails after installing factory_json in a rails project

[eduardschaeli]

factory_girl v 4.4.0 factory_girl_rails v 4.4.1

Rspec always fails with the same error:

/Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/factory_girl-4.4.0/lib/factory_girl/strategy_syntax_method_registrar.rb:19:in `block in define_singular_strategy_method': wrong number of arguments (0 for 1+) (ArgumentError)
        from /Users/eduard/Sites/local.ch/location-app/spec/support/factories/local/components/presentations.rb:11:in `block (2 levels) in <top (required)>'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/factory_girl-4.4.0/lib/factory_girl/syntax/default.rb:18:in `instance_eval'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/factory_girl-4.4.0/lib/factory_girl/syntax/default.rb:18:in `factory'
        from /Users/eduard/Sites/local.ch/location-app/spec/support/factories/local/components/presentations.rb:10:in `block in <top (required)>'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/factory_girl-4.4.0/lib/factory_girl/syntax/default.rb:49:in `instance_eval'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/factory_girl-4.4.0/lib/factory_girl/syntax/default.rb:49:in `run'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/factory_girl-4.4.0/lib/factory_girl/syntax/default.rb:7:in `define'
        from /Users/eduard/Sites/local.ch/location-app/spec/support/factories/local/components/presentations.rb:3:in `<top (required)>'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/activesupport-3.2.21/lib/active_support/dependencies.rb:251:in `require'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/activesupport-3.2.21/lib/active_support/dependencies.rb:251:in `block in require'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/activesupport-3.2.21/lib/active_support/dependencies.rb:236:in `load_dependency'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/activesupport-3.2.21/lib/active_support/dependencies.rb:251:in `require'
        from /Users/eduard/Sites/local.ch/location-app/spec/spec_helper.rb:9:in `block in <top (required)>'
        from /Users/eduard/Sites/local.ch/location-app/spec/spec_helper.rb:9:in `each'
        from /Users/eduard/Sites/local.ch/location-app/spec/spec_helper.rb:9:in `<top (required)>'
        from /Users/eduard/Sites/local.ch/location-app/spec/features/contacts_spec.rb:2:in `require'
        from /Users/eduard/Sites/local.ch/location-app/spec/features/contacts_spec.rb:2:in `<top (required)>'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `load'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `block in load_spec_files'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `each'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `load_spec_files'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:96:in `setup'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:84:in `run'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:69:in `run'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:37:in `invoke'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/gems/rspec-core-3.1.7/exe/rspec:4:in `<top (required)>'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/bin/rspec:23:in `load'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/bin/rspec:23:in `<main>'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/bin/ruby_executable_hooks:15:in `eval'
        from /Users/eduard/.rvm/gems/ruby-2.1.5@location-app/bin/ruby_executable_hooks:15:in `<main>'