ios运行失败

[nbhhcty]

This might be related to facebook/react-native#4968
To resolve try the following:

1. Clear watchman watches: watchman watch-del-all.
2. Delete the node_modules folder: rm -rf node_modules && npm install.
3. Reset packager cache: rm -fr $TMPDIR/react-* or npm start -- --reset-cache.

按照提示，也没解决问题！