Error by sending an email to a new user when i`ve trying to add it from the manager

Hello!
Please help me to decide my little trouble with Evo.
When i`ve trying to add new user for my Evo 1.3 it`s crashes out with the error that i`ve attached to this post. And still the user is created even with an error. Sending email function is works fine i`ve checked it with PHP function.
Any ideas why the error is happens?
//sorry for my great english ^__^

For some reasons the file with error has not attached. This is it