Heatmaply yields no result

I am trying to create a heatmap in RStudio using the function heatmaply. However, if I apply it to the built-in dataset mtcars for example, I get no reply at all. No errors, it simply runs and I see nothing. Could you help me out?

Thanks!

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one: