[BioC] kind request

[Aneta Pluta]

Dear Helper,
I am a new user of R package limma and I can't read my file target.
I hav information all time  like:

 library("arrayQuality")  
> library("limma")
> library("marray")
> targets <- readTargets("targets.txt", row.names="Name", path=workdir) 
> targets
  X.ţF
1   NA
2   NA
3   NA
4   NA
5   NA
6   NA
> workdir <- "D:/BIV hodowle"
> setwd(workdir)
> targets <- readTargets("targets.txt", row.names="Name", path=workdir) 
> targets
  X.ţF
1   NA
2   NA
3   NA
4   NA
5   NA
6   NA
 Please help me what mean  X.ţF
1   NA ?
I will be grateful for any help
Aneta