R help - Apr 2009 - system is exactly singular

Hi. I have a csv file. I imported it with
 mydata<-read.table("C:/dataForR/radiology/WordFrequency.csv",
header=TRUE,
sep=",")
> dim(mydata)
[1] 982 925

The first column had the doc numbers like doc1, doc2, etc.  so I did 
mydataNum<-mydata[,-1]
> dim(mydataNum)
[1] 982 924

The second to last column was also not numeric and so I
did
> mydataNum<-mydataNum[,-923]
> dim(mydataNum)
[1] 982 923

when I checked
> str(mydataNum)
I got
'data.frame':   982 obs. of  923 variables:

and then a list of all the variables and it said they were int and num.

I tried
> fit <- factanal(mydataNum, 3, rotation="varimax")
Error in solve.default(cv) : 
  Lapack routine dgesv: system is exactly singular

Any idea why this is happening?
Thanks.

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