[R] Using ADF.Test

[ehxpieterse]

Hi,

I am quite new to R and would appreciate some guidance, if possible.

I have imported a csv file: spread <- read.csv("Spread.csv")

I get the following error when I try to run adf.test:
> adf.test(spread,alternative = c("stationary", "explosive"),0)
Error in embed(y, k) : 'x' is not a vector or matrix

Why is this?
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