I want to fetch historical stock prices from Yahoo finance with "pdfetch" package for a series of tickers,this is my code: 

```
d1<-pdfetch_YAHOO(identifiers[1:636], c("high","low","close","volume"),
                  from = as.Date("2016-01-01"), to = "2016-01-30")

```

but I received this message: 

```
Error in (function (..., all = TRUE, fill = NA, suffixes = NULL, join = "outer", : unsupported data type

```

it is working, when I fetch the prices of high low and close.

any idea about it?

I saved the 636 tickers in identifiers.