title: how to run "plot_ly" function in r?
body: <p>I want plot contour plot in r. I installed "plotly" packages for that but it is giving error while calling function "plot_ly" in r as shown below in the image.</p>
  
  <p><img src="https://i.stack.imgur.com/3Td0H.jpg" alt="image"></p>
  
  <p>Can you please help me in that matter?</p>