$>$ getwd$()[1]"/$Users$/$mengxihou$">$ cust$\_$dat $=$ read$\_$csv$("../$data$/$smartphone$\_$customer$\_$data.csv$"+$ cust$\_$dat $=$ read$\_$csv$("../$data$/$smartphone$\_$customer$\_$data.csv$"$Error: unexpected symbol in:$"$cust$\_$dat $=$ read$\_$csv$("../$data$/$smartphone$\_$customer$\_$data.csv$"$cust$\_$dat"$>$ cust$\_$dat $=$ read$\_$csv$("../$data$/$smartphone$\_$customer$\_$data.csv$")$Error: $\text{'}../$data$/$smartphone$\_$customer$\_$data.csv$\text{'}$ does not exist in current working directory $(\text{'}/$Users$/$mengxihou$\text{'}).$