Please ask a reprex when asking a question in this community.
Now we have to guess which version of read.csv you are using.
If it is utils::read.csvthen you can check the documentation by typing:
? read.csv
There you see that the ... arguments (i.e. all that are not explicitly mentioned under read.csv) are passed to the read.table function. Looking there, we see that there is no argument stringsasFactors .
However the argument stringsAsFactorsexists. In R variable names are case sensitive.