Received error messages

library(forecast) <- read.csv("/Users/shalaw/Downloads/Amtrak data.csv")
ridership.ts <- ts($Ridership, start = c(1991, 1), end = c(2004, 3), freq = 12)

stepsAhead <- 36
nTrain<-length(ridership.ts)- stepsAhead
train.ts<-window(ridership.ts,start = c(1991,1),end = c(1991, nTrain))

Hello, what is the error message you received ?
We lack your Amtrack data.csv so can't run to see for ourselves...

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