Unable to use floatspace in Rmarkdown to pdf

I'm trying to use the setspace package in my rmarkdown file to increase line spacing. My YAML is as follows:

title: "assignment2"
geometry: margin= 2cm
- \usepackage{setspace}
- \singlespacing
output: pdf_document
fontsize: 12pt

Whenever I use this and try to knit to pdf though, rmarkdown just spits out the following, produces an error, and just stops after a while.

This only occurs when I try to include the setspace package. It knits to pdf fine if take that out.

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