[R] Can R markdown do beamer palo alto theme?

[C W]

Hi R list,

Is it possible to use R markdown with beamer palo alto theme?  Are they
compatible?

I copy pasted my LaTex code over to R, I get the following error message:

! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.89 \end{frame}

pandoc: Error producing PDF
Error: pandoc document conversion failed with error 43
Execution halted

Thanks for your help in advance!

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