New member data base query error

When a new member wants to log in the database query error appears, need some help.... 

INSERT INTO `Profiles` SET 
`NickName` = '',
`Password` = '1qaz2wsx',
`Email` = 'tisnetguides@gmail.com',
`DateReg` = '2011-06-21 13:41:08',
`DateLastEdit` = '0000-00-00',
`Status` = 'Active',
`DateLastLogin` = '0000-00-00',
`Featured` = 0,
`Sex` = 'male',
`LookingFor` = '',
`DescriptionMe` = '',
`DateOfBirth` = '1978-08-18',
`Headline` = '',
`Country` = 'CH',
`City` = 'zurich',
`Couple` = 0,
`Tags` = '',
`zip` = '',
`EmailNotify` = 1,
`Height` = '',
`Weight` = '',
`Income` = '',
`Occupation` = '',
`Religion` = '',
`Education` = '',
`RelationshipStatus` = '',
`Hobbies` = '',
`Interests` = '',
`Ethnicity` = '',
`FavoriteSites` = '',
`FavoriteMusic` = '',
`FavoriteFilms` = '',
`FavoriteBooks` = '',
`FirstName` = 'tisnetguides',
`LastName` = ''

Mysql error: Duplicate entry '' for key 2

Found error in the file '/var/www/vhosts/tourist20.com/httpdocs/inc/classes/BxDolProfilesController.php' at line 116.
Called 'db_res' function with erroneous argument #0.

Signups via the normal logon form or facebook connect or other connect module?

If you look at the first peram in the error it shows the nickname as empty. Which it should not be. Most likley cause of error.

Nicknames cannot be blank, so have you made any changes to the profile fields for the join form?

Thanks for the help now it´s working.....

Best regards, David

I had the same error as well when I removed "Nickname" from the join form.  I solved the problem by ADMIN PANEL>> BUILDERS>> PROFILE FIELDS>> Dragging "Nick Name" back up to ACTIVE ITEMS under General Info.

I would prefer to not have "Nicknames" and just use the real user name or user ID number.  Is there any way to allow new users to join WITHOUT requiring a Nickname?

I don't believe so. Nickname is one of the required fields in dolphin. It cannot be removed without breaking things.

I am having problems of people not joining my portal, I am using Dolphin 7x. When people try to join, I get thei message : 

Error