Error message: " The following object(s) are masked"

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Hello!

First time posting here:

Here is my code:

x <- c(1:22)
finaloutput=cidrm=NULL
finaldiversityoutput=diversitym=NULL

diversityinfo=read.table("Diversity_info.txt", header=T, sep="\t",
row.names=NULL)
attach(diversityinfo)
diversitynr=nrow(diversityinfo)
diversitytemp <- matrix(0,nrow=diversitynr,ncol=1)

for(j in 1:length(x))
{
diversitym=read.table(paste(paste("Div-Chr",x[j],
sep=""),"_corr.txt",sep=""), header=T, sep="\t", row.names=NULL)
attach(diversitym)
diversitytemp <- cbind(diversitytemp,diversitym)
print(paste(paste("Diversity-Chrom",x[j], sep=""),".txt",sep=""))
print(dim(diversitytemp))
}

I am essentially trying to combine several tab-delimited text data files
together into one big file.

I recently upgraded to R 2.2.0.  I now get multiple error messages of
the form:
The following object(s) are masked from diversitym ( position 4 ) :

         X X.1 X.2
These are *Warning* messges, not errors.

You are using attach but never detach in your loop. Each attach masks 
the objects you have attached formerly, because there are the same names 
in it, obviously.

Your code works as before, but you should not use attach without 
detaching. I'd suggest not to use attach() at all unless you know what 
you are doing and it really improved convenience in interactive analyses.

Uwe Ligges
I searched on "masked" and read the manual about "conflicts" but I don't
really understand what the issue is.  I didn't get this error message,
using the same code with R 2.1.0.  Can somebody help (I'm not a
programmer).

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