stopping at the splash react native

stopping at the splash screen even though no error has occurred.

I did react-native run-ios.It's success. but stopping at the splash screen.

I use react native .

I try it. and reload.

watchman watch-del-all && rm -rf node_modules/ && rm -rf ios/build && npm cache clean --force && npm install && rm -rf $TMPDIR/react-* && rm -rf $TMPDIR/haste-* && rm -rf $TMPDIR/metro-* && rm -rf ~/Library/Developer/Xcode/DerivedData/ ```[Did this][1]but ,the result does not change.  [1]: https://qiita.com/yuitnnn/items/62a8c95de14f494ee15f