[wp-hackers] [report] Error adding new user - Multisite

[wpmidia lab]

I received this error when I tried to add an user on Network Panel:

*Warning*: sprintf()
[function.sprintf<http://ipeposgraduacao.com.br/site/wp-admin/network/function.sprintf>]:
Too few arguments in */home/[...]/site/wp-includes/ms-functions.php* on
line *1065*

*Warning*: Cannot modify header information - headers already sent by
(output started at /home/[...]/site/wp-includes/ms-functions.php:1065) in *
/home/[...]/site/wp-includes/pluggable.php* on line*876*

What is this? How to proceed?

-- 
*Míriam de Paula *
*Twitter:* @miriamdepaula

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