为什么link然后react-native run-android就会出错呢？

[boonook]

BUILD FAILED in 20s
110 actionable tasks: 87 executed, 23 up-to-date
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/getting-started.html

settings.gradle
include ':RCTHttpCache'
project(':RCTHttpCache').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-http-cache2/android')