如何为react render外dom增加ref标签？

Question

示例代码

mines[i] = (
      <p key = {i} ref = {i}></p>
      );
      .....
      render(
          return(
              {mines}
          )
      )

此时，当刚刚渲染上去的时候，会提示报错

addComponentAsRefTo(...): Only a ReactOwner can have refs. You might be adding a ref to a component that was not created inside a component's render method, or you have multiple copies of React loaded.

请问怎么解决问题。。