[R] Random Forest Reading N/A's, I don't see them

[Lost in R]

I've also attached here a sample of my data in Excel. I'm thinking it must be
a problem with a character, but can't figure it out. Is there a list
somewhere of characters to avoid in R?

Thanks,
Mike

http://r.789695.n4.nabble.com/file/n4205479/Sample_Data_Set.csv
Sample_Data_Set.csv 

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