Error in AR order using quantmod

I am trying to fo Augment dickey -fuller test using quantmod for a class project and have following code; and get the error. Am I missing any library since I only have quantmod , please help , I am new to this and seem lost ; thanks in advance

AAPL <- na.omit(AAPL.rtn) # removes the NAs
m1=ar(AAPL, method='mle')

Error in ar.mle(x, aic = aic, order.max = order.max, na.action = na.action, :
MLE only implemented for univariate series

Do you want AAPL.rtn rather than AAPL?

I put AAPl since I omitted the na variable. I tried doing with AAPL.rtn but same error

Leave off method='mle'

it worked thanks a lot , appreciate much

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