Native linking failed undefined_kFIRLoggerAuth

[420tech]

My issue is identical to #535 but I am using Crashlytics.

[420tech]

The errors I am getting are:
MTOUCH : error MT5210: Native linking failed, undefined symbol: _kFIRLoggerAuth. Please verify that all the necessary frameworks have been referenced and native libraries are properly linked in.
MTOUCH : error MT5201: Native linking failed. Please review the build log and the user flags provided to gcc: -ObjC -lc++ -lsqlite3 -lz -Xlinker -sectcreate -Xlinker __TEXT -Xlinker __entitlements -Xlinker /Users/timbelvin/Projects/css-mobile/CivicMobile.iOS/obj/iPhoneSimulator/Debug/Entitlements.xcent
clang : error : linker command failed with exit code 1 (use -v to see invocation)

I am trying to use Crashlytics.