readDGE: Error in colnames/length of dimnames not equal to array extent

Hello, all,

I'm a new R user (new to any programming language in general, really), so I
apologize if this is easy/has already been answered (I've attempted
searching online but did not understand the pages I found).

My data is stored in text files with the headers LANE, RNA_NAME, SEQ, and
SEQCNT. I've been using

x = "filename.txt"
y = aggregate(x$SEQCNT, list(x$RNA_NAME), sum)
write.table(y, "C:/path/filename.txt", sep="\t")

to generate an output that I've analyzed using readDGE in the edgeR package:

RNA Targets = read.delim("Targets.txt", stringsAsFactors = FALSE)
Targets

Files      Groups
A.txt     1
B.txt     2

v = readDGE(Targets, skip = 5, comment.char = "!")

I've done this several times; until yesterday, it worked fine. Today,
however, an error message started cropping up after attempting readDGE:

Error in `colnames<-`(`*tmp*`, value = c("1", "2")) :
   length of 'dimnames' [2] not equal to array extent

I've tried to figure this out with no luck, so absolutely any help would be
appreciated. Thank you all!

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