[R] how to make this time series data stationary ?

[sagarnikam123]

i have below file as time series data
http://r.789695.n4.nabble.com/file/n4494907/1A2X_B_phi_psi_pot_r_k.txt
1A2X_B_phi_psi_pot_r_k.txt 
i used autofit function from "itsmr" package

>k<-read.table(file.choose())
> ar(k$V1)
Call:
ar(x = k$V1)
Order selected 0  sigma^2 estimated as  0.2499

> autofit(k$V1)
Error in arima(x, c(p, 0, q)) : non-stationary AR part from CSS

what is this CSS ?& hot to make it stationary

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