Getting error when doing a carthage update --platform ios! What should I do?

[shyamalschandra]

Shyamals-iMac-2:Go-Flashcards shyamalchandra$ carthage update --platform ios
*** Cloning realm-cocoa
*** Cloning ZLSwipeableViewSwift
*** Downloading binary-only framework Crashlytics at "https://raw.githubusercontent.com/Building42/Specs/master/Carthage/Crashlytics.json"
Unable to parse binary-only framework JSON at https://raw.githubusercontent.com/Building42/Specs/master/Carthage/Crashlytics.json due to error: invalid JSON: dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "JSON text did not start with array or object and option to allow fragments not set." UserInfo={NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.})))