logo: in yaml breaks flex_dashboard when using runtime: shiny

[blitz2057]

Below is my yaml without logo: and I do have the yaml indented correctly. How can I fix this.

---
title: "Super Measures Dashboard"
output: 
   flexdashboard::flex_dashboard:
    theme: sandstone
    orientation: rows
    vertical_layout: fill
    source_code: embed
runtime: shiny
---

Below is the result:

Now the yaml with the logo:

---
title: "Supermeasures Dashboard"
output: 
  flexdashboard::flex_dashboard:
    logo: logo.png
    theme: sandstone
    orientation: rows
    vertical_layout: fill
    source_code: embed
runtime: shiny
---

Below is the result: