Reactnative Awesome 元素没有构建 android 元素

我正在努力学习react native，但无法构建演示项目.我已经在~/.bash_profilefile中设置了$ANDROID_HOME变量.但每次我构建它时，都会出现以下错误.

出了什么问题:

 A problem occurred configuring project ':app'.
 Could not resolve all dependencies for configuration ':app:_debugCompile'.
 Could not find com.android.support:appcompat-v7:23.0.1.
 Searched in the following locations:
     file:/Users/<username>/.m2/repository/com/android/support/appcompat-v7/23.0.1/appcompat-v7-23.0.1.pom
     file:/Users/<username>/.m2/repository/com/android/support/appcompat-v7/23.0.1/appcompat-v7-23.0.1.jar
     https://jcenter.bintray.com/com/android/support/appcompat-v7/23.0.1/appcompat-v7-23.0.1.pom
     https://jcenter.bintray.com/com/android/support/appcompat-v7/23.0.1/appcompat-v7-23.0.1.jar
 Required by:
     AwesomeProject:app:unspecified
 Could not find com.android.support:appcompat-v7:23.0.1.
 Searched in the following locations:
     file:/Users/<username>/.m2/repository/com/android/support/appcompat-v7/23.0.1/appcompat-v7-23.0.1.pom
     file:/Users/<username>/.m2/repository/com/android/support/appcompat-v7/23.0.1/appcompat-v7-23.0.1.jar
     https link     Required by:
     AwesomeProject:app:unspecified > com.facebook.react:react-native:0.11.0
 Could not find com.android.support:support-v4:21.0.3.
 Searched in the following locations:
     file:/Users/<username>/.m2/repository/com/android/support/support-v4/21.0.3/support-v4-21.0.3.pom
     file:/Users/<username>/.m2/repository/com/android/support/support-v4/21.0.3/support-v4-21.0.3.jar
     https link
 Required by:
     AwesomeProject:app:unspecified > com.facebook.react:react-native:0.11.0 > com.facebook.fresco:fresco:0.6.1 > com.facebook.fresco:drawee:0.6.1
     AwesomeProject:app:unspecified > com.facebook.react:react-native:0.11.0 > com.facebook.fresco:fresco:0.6.1 > com.facebook.fresco:imagepipeline:0.6.1

我不知道它为什么会出现在这个文件夹文件中:

/Users/<username>/.m2/repository/com/android/support/appcompat-v7/23.0.1

安装的sdk版本仍然是23.0.1，我收到了这个错误.

我有点网络背景，想学英语.