You're starting with a hash, not a hash ref, so you never declared $errors. 
my $errors = {}; #or my $errors=\%existing_hash;
my $array_ref=[%$errors];
my $csvout = new IO::File "> csvoutput.csv";
my $status = $csv->print ($csvout, [%$errors])

[download]
or 
my %errors = ();
my $array_ref=[%errors];
my $csvout = new IO::File "> csvoutput.csv";
my $status = $csv->print ($csvout, [%$errors])

[download]
should work.

Edit: this was a block copy to show what changed. I did not test it, and the last line in each case should be 
my $status = $csv->print ($csvout, $array_ref);

[download]

In reply to Re: hashref to arrayref by ssandv
in thread hashref to arrayref by mcarthey

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