Plotly not found error in javascript code

I am trying to use the snipet of code provided and I am getting an error in the line:
Plotly.newPlot(‘myDiv’, data, {}, {showSendToCloud: true});

There error is ‘cannot find name’. Is there other setup required other than the line below?

Thank you!

HTML:

JS:
Plotly.newPlot(‘myDiv’, data, {}, {showSendToCloud: true});

have you loaded plotly ?