Add the run script provided by fabric to you. The follwing screenshot demonstrates where to add the runscript.
Reply from Mattie, Twitter Staff
Yes. It turns out that Crashlytics does not support building with a base SDK older than "latest" for any given Xcode release. It's extremely hard for us to maintain build compatibility with older SDKs, even if we can maintain runtime compatibility.
So I need change the base SDK to latest one and revamp my codes..
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