"Argument "Erreur http" isn't numeric in addition (+) at /usr/lib/cgi-bin/ipn.pl line 74.: /usr/lib/cgi-bin/ipn.pl"

Line 74 of what you posted doesn't seem to be line 74 of what you are running to produce this error...

In reply to Re^3: PayPal IPN Script End of script output before headers: by marto
in thread PayPal IPN Script End of script output before headers: by *alexandre*

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