Shenzen ios costruisce dando errore

Ricevo il seguente errore durante l'esecuzione dell'utilità Shenzen ( https://github.com/nomad/shenzhen ). Sto usando Xcode 6 beta 4 cercando di creare un'app ios. qualche idea?

ipa build Select a scheme: 1. FieldApp-LOCAL 2. FieldApp-RELEASE ? 2 xcodebuild FieldApp.xcworkspace 2014-07-28 09:00:43.703 xcodebuild[35326:1912070] [MT] DVTAssertions: Warning in /SourceCache/IDEFrameworks/IDEFrameworks-6244.6/IDEFoundation/SourceControl/Model/IDESourceControlManager.m:432 Details: Error Domain=com.apple.dt.IDESourceControlErrorDomain Code=-1 "Missing extension: public.vcs.subversion" UserInfo=0x7fb4a2cb14a0 {NSLocalizedDescription=Missing extension: public.vcs.subversion} Object: <IDESourceControlManager: 0x7fb4a072c9e0> Method: -loadRepositories Thread: <NSThread: 0x7fb4a0605350>{number = 1, name = main} Please file a bug at http://bugreport.apple.com with this warning message and any useful information you can provide. ** ARCHIVE FAILED ** The following build commands failed: DataModelVersionCompile /Users/seanzehnder/Library/Developer/Xcode/DerivedData/FieldApp-heytvqitcxovbbegdtzbrxjofaty/Build/Intermediates/ArchiveIntermediates/FieldApp-RELEASE/InstallationBuildProductsLocation/Applications/Visit\ Tracker.app/FieldApp.momd DataModel/FieldApp.xcdatamodeld DataModelVersionCompile /Users/seanzehnder/Library/Developer/Xcode/DerivedData/FieldApp-heytvqitcxovbbegdtzbrxjofaty/Build/Intermediates/ArchiveIntermediates/FieldApp-RELEASE/InstallationBuildProductsLocation/Applications/Visit\ Tracker.app/FieldApp.momd DataModel/FieldApp.xcdatamodeld (2 failures) 

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