getCurrentUser 问题

java.lang.StringIndexOutOfBoundsException: length=0; index=8

是初始化错了吗？
`public class MateApplication extends Application {

public static MateApplication instance;

public static MateApplication getInstance() {
    if (instance == null) {
        instance = new MateApplication();
    }
    return instance;
}

@Override
public void onCreate() {
    super.onCreate();
    initLeancloud();
}

private void initLeancloud() {
    AVOSCloud.initialize(this, Constants.Leancloud_APP_ID, Constants.Leancloud_APP_KEY);
    // 在 AVOSCloud.initialize() 之前调用
    AVOSCloud.setLogLevel(AVLogger.Level.DEBUG);
}

}
`