3 x Build Failed

[thinklog]

Hi. Alas, it didn't compile. I get the following errors: ** BUILD FAILED **

The following build commands failed: CompileC /Users/thinklog/Development/react_native/reactnative-jwts/ios/build/Build/Intermediates/RCTLinking.build/Debug-iphonesimulator/RCTLinking.build/Objects-normal/x86_64/RCTLinkingManager.o RCTLinkingManager.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler CompileC /Users/thinklog/Development/react_native/reactnative-jwts/ios/build/Build/Intermediates/A0RNLock.build/Debug-iphonesimulator/A0RNLock.build/Objects-normal/x86_64/A0ObjectSerializer.o A0RNLock/Core/A0ObjectSerializer.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler CompileC /Users/thinklog/Development/react_native/reactnative-jwts/ios/build/Build/Intermediates/RCTWebSocket.build/Debug-iphonesimulator/RCTWebSocket.build/Objects-normal/x86_64/RCTWebSocketExecutor.o RCTWebSocketExecutor.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler (3 failures)

Any ideas what's happening and why, and how to correct it would be much appreciated. Thanks.