This is not an error, it is a warning.
Your data do not seem to be comma separated, but the script sets $column_separator to qr/,/.
Also, please check the closing code tag. It is missing a slash.
Update: use Text::CSV is a step in the right direction. The script does not profit from the module in any way, though.
Update 2:
To read from a file, you have to open it for reading, not appending.
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