Error while reading csv file in R

I found this problem is caused by code of file, and I solved that by opening it with Windows note, saving with UTF-8, and reopening with Excel(it became garbled at first), and resaving with UTF-8, then it worked!

The cause is an invalid encoding. I have solved replacing all the "è" with e

This will read the column names as-is and won't return any errors:

x = read.csv(check.names = F)

To remove/replace troublesome characters in column names, use this:

iconv(names(x), to = "ASCII", sub = "")