Rmarkdown error in eval, object not found - r

I have been trying to knit my rmd file, but keep getting an error message
line 56 Error in eval(expr, envir, enclos) : object 'gol.fac' not found Calls: ... handle -> withCallingHandlers -> withVisible -> eval -> eval Execution halted
```{r}
data(golub, package = "multtest")
grep("Zyxin",golub.gnames[,2])
all <- golub[2124,gol.fac=="ALL"]
aml <- golub[2124,gol.fac=="AML"]
summary(all)
summary(aml)
```
Line 56 is the first line after the ```{r}.
I am not sure why it is giving me errors, when I am able to run the code before knitting

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Calls: ...withVisible -> eval_with_user_handlers -> eval -> eval
Execution halted
This was my code. I'm confused because I thought I defined AVG in the second line. Any ideas?
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Quitting from lines 42-44 (MODIS_TimeSeriesProcessor.Rmd)
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Quitting from lines 15-139 (m.Rmd)
Erro em $<-.data.frame(*tmp*, "efavirens", value = integer(0)) :
replacement has 0 rows, data has 5794
Calls: ... withVisible -> eval -> eval -> $<- -> $<-.data.frame
Execu��o interrompida
The following is a part of the script:
```{r, echo=FALSE}
suicidio <- read.csv2("E:/Spss/suicidio4.csv",header=T,sep=";")
str(suicidio)
suicidio<-subset(suicidio,desfecho != 9)
suicidio2<-subset(suicidio,Desfecho2 != 9)
suicidio$tempo<-as.numeric(suicidio$tempo)
suicidio$dias_inicio[suicidio$dias_inicio_cont == "#NULO!"]<-NA
suicidio$dias_fim[suicidio$dias_fim_cont == "#NULO!"]<-NA
suicidio$cor[suicidio$A19_COR == "#NULO!"]<-NA
suicidio$sexo<-factor(suicidio$sexo)
suicidio$cor<-factor(suicidio$cor)
suicidio$obito<-factor(suicidio$obito)
suicidio$escol2<-factor(suicidio$escol3)
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suicidio$idade_hiv_cat<-factor(suicidio$idade_dtfim_cat)
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Can someone help me?

This is not a R Markdown error, this is an R error, telling you that you have a bug in your R code. Run the script line by line (CTRL+Enter is a good shortcut) and see which one gives the error. It is basically saying that you are trying to overwrite a column with 5794 cells/rows with a vector that has no data in it (something where length(x) would yield 0; printing the object would report factor(0) or character(0), or whatever the data type).

KnitR unable to download documents

I am able to run this code normally in R.
setInternet2(use = TRUE)
download.file("http://d396qusza40orc.cloudfront.net/dsscapstone/dataset/Coursera-SwiftKey.zip", "Coursera-SwiftKey.zip", method = "curl", mode = 'wb')
unzip("Coursera-SwiftKey.zip", files=c("final/en_US/en_US.twitter.txt", "final/en_US/en_US.news.txt", "final/en_US/en_US.blogs.txt"), exdir=".")
But when i try to use knitR it gives me this error
Quitting from lines 15-21 (milestone.Rmd)
Error in parse(text = x, srcfile = src) : <text>:5:106: unexpected ')'
4: unzip("Coursera-SwiftKey.zip", files=c("final/en_US/en_US.twitter.txt", "final/en_US/en_US.news.txt", "final/en_US/en_US.blogs.txt"), exdir=".")
5: file.copy(c("final/en_US/en_US.twitter.txt", "final/en_US/en_US.news.txt", "final/en_US/en_US.blogs.txt"?)
^
Calls: <Anonymous> ... <Anonymous> -> parse_all -> parse_all.character -> parse
Execution halted
I am using R Studio and MAC OS X.
I tried removing the s from https but it still di not work.

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