Kotlin butterknife build error @BindView fields must not be private or static

1. 如何添加butterknife
   请参考链接https://blog.csdn.net/qq_41063141/article/details/82828047

2. 添加注解 @JvmField

  @JvmField
  @BindView(R.id.ll_yijian)
  var llYijian: LinearLayout? = null