Can't send out an invitation = 500 error Page

Hi

I'm trying to get here a friend of mine, but it seams that it is impossible to send out an invitation => gives out <500 error page>

from the other side - he tried to sign up (twice with different email addresses), but confirmation email never came in.

Time? ok, i've been trying to send out this invitation many times - I'm trying it 2-3 times a week and now it is well over 1 month, but the results are the same.

:/ not nice at all

SORTED

-> he signed up via mobile phone and got the confirmation link immediately.

good

.. but the problem is still there