when I add a user I get error messege

when I add a user I get error messege

by Miki Alliel -
Number of replies: 0
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I'm the admin and from my computer (where the internet works and my server is my localhost) anyway I add a student and fill his details and when I send it I keep getting this messege :

   ERROR: Could not instantiate mail function.

 
 

Tried to send you an email but failed!

so the student didn't get  this confirmation email  what shelI do??

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