No bundle url presentのエラー。
https://github.com/facebook/react-native/issues/12754
ios/Info.plist
に。
<key>NSAppTransportSecurity</key> <dict> <key>NSAllowsArbitraryLoads</key> <true/> <key>NSAllowsArbitraryLoadsInWebContent</key> <true/> <key>NSAllowsLocalNetworking</key> <true/> </dict> </key>