I just a have strange error on the exist but output is quiet fine

Use of uninitialized value in split at ./dpi.pl line 9, <> line 11.
"";;;;;""
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That's not an error, just a warning, about the fact that $row->[5] is undef. From the output I suspect you've just got an empty line at the end of your input (line 11, as the message says).