Your connection with build host fail
You got error: 500 when connect to the build host
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Check if you have Xcode installed on /Applications/Xcode.app
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Check if the Documentation of Xcode is installed.(http://screencast.com/t/f3Kku2iggDeY)
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Check if this path exist on your Mac. (http://screencast.com/t/uO96fjK3fhY)
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Documentation/
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If is empty, create a symbolic link from DocSets (http://screencast.com/t/dmN00AYw9k)
~/Library/Developer/Shared/Documentation/
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to
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Documentation/DocSets
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After that, your folder DocSets should contain a few .docset files (http://screencast.com/t/nPQsVxxMAD)