Did you try the answer you got over at StackOverflow
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To answer your question, seek requires a file handle as its first argument. Note how the seek call has $fh (a file handle) as its first argument, and not the file name (copy/pasted from SO, comments mine):
my $offset = 1;
# create a file handle from the file name
open my $fh, '<', 'DCMFReport.txt' or die $!;
# call seek, with the new file handle we just created
seek $fh, $offset, 0 or die "Report seek error, offset:$offset - $!";
Also, please put your code into <code></code> tags. As you can see in your post, it's not very readable as is. Review Markup in the Monastery.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.