Android Studio无法关联Api23源码-提示Souces for android api 23 platform not found

<jdk version="2">
      <name value="Android API 23 Platform" />
      <type value="Android SDK" />
      <homePath value="D:\Android\sdk" />
      <roots>
        <annotationsPath>
          <root type="composite">
            <root type="simple" url="jar://$APPLICATION_HOME_DIR$/plugins/android/lib/androidAnnotations.jar!/" />
          </root>
        </annotationsPath>
        <classPath>
          <root type="composite">
            <root type="simple" url="jar://D:/Android/sdk/platforms/android-23/android.jar!/" />
            <root type="simple" url="file://D:/Android/sdk/platforms/android-23/data/res" />
          </root>
        </classPath>
        <javadocPath>
          <root type="composite">
            <root type="simple" url="file://D:/Android/sdk/docs/reference" />
          </root>
        </javadocPath>
        <sourcePath>
          <root type="composite">
            <root type="simple" url="file://D:/Android/sdk/sources/android-23" />
          </root>
        </sourcePath>
      </roots>
      <additional jdk="1.7" sdk="android-23" />
    </jdk>