[BioC] edgeR Error in `colnames<-`(`*tmp*`, value = c(\"1\", \"2\", \"3\", \"4\")) :

[Senhao Zhang [guest]]

Hi,
I am learning edgeR. I don't have any prior knowledge about programing language.
When I got some exercises in case study 1, according to the edgeR's user's guide, I got an error.

> d <- readDGE(targets, skip=5, comment.char="!")
Error in `colnames<-`(`*tmp*`, value = c("1", "2", "3", "4")) : 
  length of 'dimnames' [2] not equal to array extent

I searched around, but I haven't fixed it yet.
Any responses would be greatly appreciated.
Thank you!

 -- output of sessionInfo(): 

> targets <- read.delim("Targets.txt",stringsAsFactors=FALSE)
> targets
       file group  description
1   NC1.txt    NC Normal colon
2   NC2.txt    NC Normal colon
3  Tu98.txt    Tu       tumour
4 Tu102.txt    Tu       tumour
> d <- readDGE(targets, skip=5, comment.char="!")
Error in `colnames<-`(`*tmp*`, value = c("1", "2", "3", "4")) : 
  length of 'dimnames' [2] not equal to array extent

> summary(targets)
     file              group           description       
 Length:4           Length:4           Length:4          
 Class :character   Class :character   Class :character  
 Mode  :character   Mode  :character   Mode  :character  
> names(targets)
[1] "file"        "group"       "description"
> str(targets)
'data.frame':	4 obs. of  3 variables:
 $ file       : chr  "NC1.txt" "NC2.txt" "Tu98.txt" "Tu102.txt"
 $ group      : chr  "NC" "NC" "Tu" "Tu"
 $ description: chr  "Normal colon" "Normal colon" "tumour" "tumour"

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