r – acf function does not give an expected result

I have time-series data. I tried to plot it in R. The data looks very stationary. Then, I tried to use acf and pacf functions. However, acf function gave me a strange result. pacf return and error.
Here is the data:

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-3.99665218194447, 2.61784826282278, -6.36904427551419, -3.55611618355355)), row.names = c(NA, -698L), class = c("tbl_df", "tbl", "data.frame"))`

My code is as follow: 

Oildat <- OilData(,c(2:5))
##Convert to ts
OilDat <- ts(Oildat)
View(OilDat)
## Plot the data
autoplot(OilDat) +
    ggtitle("Oildat Time-Series") +
    theme(plot.title = element_text(hjust = 0.5))
st.test <- lapply(1:4, function(i) Box.test(OilDat(,i), type="Ljung-Box"))
st.test
acf.dat <- lapply(1:5, function(i) acf(OilDat((i)), lag.max = 20))
pacf.dat <- lapply(1:5, function(i) pacf(OilDat((i)), lag.max = 20))

Any help, please?