Off topic:Error While Combining Multiple Csv

Question

[Bmusungu]

> files <- list.files(pattern=".csv")
> files
[1] "GDS2475.csv"       "GDS2477.csv"       "GSE12594_soft.csv"
[4] "GSE15435.csv"      "GSE20130.csv"     

> data()
> DF <- NULL
> for (f in files) {
+    dat <- read.csv(f, header=T, sep="\t", na.strings="", 
+ colClasses="character")
+    DF <- rbind(DF, dat)
+ }
Error in match.names(clabs, names(xi)) : 
  names do not match previous names
>

I saw this script for reading multiple csv files and combining. I got the error in the bottom. Any suggestions would be helpful, because I am new to R.