Error only when running whole block of code - r

Question

I have code that came with a dataset that I downloaded. This code is supposed to convert factor variables to numeric. When I run each line individually, it works fine, but if I try to highlight a whole section, then I get the following error:
Error: unexpected input in ...
It gives me this error for every line of code, but again if I run each line individually, then it works fine. I've never run into this before. What's going on?? Thanks!
Here's the code that I'm trying to run:
library(prettyR)
lbls <- sort(levels(DF$myVar))
lbls <- (sub("^\\([0-9]+\\) +(.+$)", "\\1", lbls))
DF$myVar <- as.numeric(sub("^\\(0*([0-9]+)\\).+$", "\\1", DF$myVar))
DF$myVar <- add.value.labels(DF$myVar, lbls)
And here is the output with the errors:
> library(prettyR)
"rror: unexpected input in "library(prettyR)
> lbls <- sort(levels(DF$myVar))
"rror: unexpected input in "lbls <- sort(levels(DF$myVar))
> lbls <- (sub("^\\([0-9]+\\) +(.+$)", "\\1", lbls))
"rror: unexpected input in "lbls <- (sub("^\\([0-9]+\\) +(.+$)", "\\1", lbls))
> surv.df$myVar <- as.numeric(sub("^\\(0*([0-9]+)\\).+$", "\\1", DF$myVar))
"rror: unexpected input in "DF$myVar <- as.numeric(sub("^\\(0*([0-9]+)\\).+$", "\\1",DF$myVar))
> surv.df$BATTLEGROUND <- add.value.labels(DF$myVar, lbls)
Error in add.value.labels(surv.df$myVar, lbls) :
object 'lbls' not found

Answer 1

I figured out the issue (actually someone told me what the problem was)
The code was downloaded as a .R file and must have been written using a text editor with non-standard "new line" coding. So I just copied the code to a text editor, did replace all to switch "\n" to
"#####". Then I used replace all again to switch back to new-lines and copied it back into R studio.
And everything works!