Mybb error !! HELP

[virus_in_town]

Hello everyone , after reading alot about Mybb i decided to use it on my site so i installed it ,everything worked like charm but i am getting some errors in Admin area.


1-http://www.my_site_.com/admin/index.php?module=user-users&action=add( I am trying to create new user)

Error--

Warning [2] explode() expects parameter 2 to be string, array given - Line: 3640 - File: admin/modules/user/users.php PHP 5.3.1 (Linux)
File Line Function
[PHP] errorHandler->error
/admin/modules/user/users.php 3640 explode
/admin/modules/user/users.php 541 output_custom_profile_fields
/admin/index.php 483 require

Fatal error: Unsupported operand types in /home/my_site_location/public_html/admin/modules/user/users.php on line 3640

I am getting same error when i try use Edit user->Profile ( I only have administrator account on forum yet no other registered users)

Any advice?