fastlane: XCode 8 beta 6 and Swift 2.3 Dont seem to cooperate with fastlane

New Issue Checklist

• Updated fastlane to the latest version
• I have read the Contribution Guidelines

Issue Description

Fastlane gives a Exit status: 65 error when I try building with Xcode 8 Beta 6

Complete output when running fastlane, including the stack trace and command used

The following build commands failed:
ExternalBuildToolExecution Carthage
(1 failure)
ERROR [2016-09-09 15:15:43.32]: Exit status: 65
/usr/local/lib/ruby/gems/2.3.0/gems/fastlane_core-0.51.0/lib/fastlane_core/ui/interface.rb:145:in `user_error!': [!] Error building the application - see the log above (FastlaneCore::Interface::FastlaneError)
    from /usr/local/lib/ruby/gems/2.3.0/gems/fastlane_core-0.51.0/lib/fastlane_core/ui/ui.rb:14:in `method_missing'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/error_handler.rb:53:in `handle_build_error'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/runner.rb:101:in `block in build_app'
    from /usr/local/lib/ruby/gems/2.3.0/gems/fastlane_core-0.51.0/lib/fastlane_core/command_executor.rb:88:in `execute'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/runner.rb:97:in `build_app'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/runner.rb:12:in `run'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/manager.rb:10:in `work'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/commands_generator.rb:42:in `block (2 levels) in run'
    from /usr/local/lib/ruby/gems/2.3.0/gems/commander-4.4.0/lib/commander/command.rb:178:in `call'
    from /usr/local/lib/ruby/gems/2.3.0/gems/commander-4.4.0/lib/commander/command.rb:153:in `run'
    from /usr/local/lib/ruby/gems/2.3.0/gems/commander-4.4.0/lib/commander/runner.rb:444:in `run_active_command'
    from /usr/local/lib/ruby/gems/2.3.0/gems/fastlane_core-0.51.0/lib/fastlane_core/ui/fastlane_runner.rb:36:in `run!'
    from /usr/local/lib/ruby/gems/2.3.0/gems/commander-4.4.0/lib/commander/delegates.rb:15:in `run!'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/commands_generator.rb:61:in `run'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/lib/gym/commands_generator.rb:15:in `start'
    from /usr/local/lib/ruby/gems/2.3.0/gems/gym-1.9.0/bin/gym:6:in `<top (required)>'
    from /usr/local/bin/gym:22:in `load'
    from /usr/local/bin/gym:22:in `<main>'

Environment

fastlane version (run fastlane -v): fastlane_core-0.50.2 fastlane-1.101.0

Using Circle CI