I updated my pods and I get this error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'

as this line 986:
[messageNavigationController.view insertSubview:self belowSubview:messageNavigationController.navigationBar];

I have this in my pod file:
pod 'RMessage', :git => 'https://github.com/donileo/RMessage.git', :branch => 'develop'

I use iPhone 6s, iOS 11.2