When I want to invite someone, it tells me :

"
Notice: Undefined variable: php_errormsg in /home/www/toxic.atwebpages.com/Vanilla/library/Framework/Framework.Class.Email.php on line 158
A fatal, non-recoverable error has occurred
Technical information (for support personel):

Error Message
An error occurred while sending the email.
Affected Elements
Email.Send();

For additional support documentation, visit the Lussumo Documentation website at: lussumo.com/docs
"