use is done before any print. If CGI::Carp is available, insert 
use CGI::Carp 'fatalsToBrowser';

[download]
right after she shebang line.

Update: better: 

use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

[download]

In reply to Re^2: Captcha::reCAPTCHA::V2 Not Working by soonix
in thread Captcha::reCAPTCHA::V2 Not Working by jack778

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