After installing/linking/cleaning/building version 1.1.1, I get these build errors:
/app/node_modules/lottie-react-native/lib/ios/LottieReactNative/LRNAnimationViewManager.m:57:37: Incompatible block pointer types sending 'void (^)(RCTUIManager *__strong, NSDictionary<NSNumber *,UIView *> *__strong)' to parameter of type 'RCTViewManagerUIBlock' (aka 'void (^)(RCTUIManager *__strong, RCTSparseArray *__strong)')
/app/node_modules/lottie-react-native/lib/ios/LottieReactNative/LRNAnimationViewManager.m:70:37: Incompatible block pointer types sending 'void (^)(RCTUIManager *__strong, NSDictionary<NSNumber *,UIView *> *__strong)' to parameter of type 'RCTViewManagerUIBlock' (aka 'void (^)(RCTUIManager *__strong, RCTSparseArray *__strong)')

I had the same issue but react-native upgrade solved the issue for me
@Jpunt @iDevo Is this still an issue?
Had the same problem in React Native 0.50.3. Noticed that I had deprecated React dependency in cocoapods. Solved by adding next lines to Podfile:
pod 'React', path: '../node_modules/react-native'
pod 'yoga', :path => '../node_modules/react-native/ReactCommon/yoga'
Closing this as hopefully he above works. Feel free to reopen if that's not the case.
Most helpful comment
Had the same problem in React Native 0.50.3. Noticed that I had deprecated React dependency in cocoapods. Solved by adding next lines to
Podfile: