installing packages in R - warning messages : <p>I tried to install packages in R. But, R software gives warning messages in the below picture. How to install packages in ?</p>

<p><a href="https://i.stack.imgur.com/naDtw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/naDtw.png" alt="enter image description here"></a></p>
