Error in parse(text = script) : parse error in text argument: symbol `` must be written using backticks

[Anthony Bordonaro 2]

Got this error and saw few others have similar issues. The only thing is that my code does not have any `` anywhere..

The first occurance of this happens here to the below lines of code

min.RSS 0) {

startQi = max(data$Prod[idx], na.rm=TRUE)

fit