futurepress/epubjs-rn

undefined is not an object(evaluating '_react2.proptypes.string')- IOS

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i have implemented epub reader in my project. so for that i used epubjs-rn library it is working properly in android as a expected but it gives an error while building in ios.
it gives error as below:

undefined is not an object(evaluating '_react2.proptypes.string')

Environment:
OS: macOS Sierra 10.12.6
Node: 9.6.1
Yarn: Not Found
npm: 4.6.1
Watchman: 4.9.0
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: 2.3 AI-162.4069837

Packages: (wanted => installed)
react: 16.0.0-beta.5 => 16.0.0-beta.5
react-native: ^0.49.3 => 0.49.5

can anyone please help to resolve this error?