Error in viewing profiles in certain groups

I have created about 8 different types of groups. Two initial a week back and 6 later. I dont know what i have in past week with the initial 2 groups but the seem to work fine, while the new groups gives some error message when trying to see civicrm/profile?reset=1&gid=N (where N=3,4,..8) N=1,2 works fine.. The message i get are:

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warning: Invalid argument supplied for foreach() in /var/www/html/den/modules/civicrm/CRM/Profile/Page/Listings.php on line 100.

warning: Invalid argument supplied for foreach() in /var/www/html/den/modules/civicrm/CRM/Contact/BAO/Contact.php on line 1466.

warning: Invalid argument supplied for foreach() in /var/www/html/den/modules/civicrm/CRM/Profile/Selector/Listings.php on line 210.

warning: Invalid argument supplied for foreach() in /var/www/html/den/modules/civicrm/CRM/Profile/Selector/Listings.php on line 298.

warning: Cannot modify header information - headers already sent by (output started at /var/www/html/den/includes/common.inc:384) in /var/www/html/den/modules/civicrm/CRM/Utils/System.php on line 392.
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But if i go through usual channels of links which exists on website, all groups work fine, and i can see all members of group=3 through civicrm/group/search?reset=1&force=1&context=smog&gid=3 but not through civicrm/profile?reset=1&gid=3 where as for gid=1 both works fine..

I gues this is reason why when i am trying to import profiles in two groups, one in 1 or 2 and the other in 3-8 it gives error..

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Sorry. A non-recoverable error has occurred.

Database Error Code: Cannot add or update a child row: a foreign key constraint fails, 1216

Return to CiviCRM menu.

error

Array
(
[callback] => Array
(
[0] => CRM_Core_Error
[1] => handle
)

[code] => -3
[message] => DB Error: constraint violation
[mode] => 16
[debug_info] => INSERT INTO civicrm_subscription_history (contact_id , group_id , date , method , status , tracking ) VALUES ( 0 , 1 , 20060110130916 , 'Admin' , 'Added' , NULL ) [nativecode=1216 ** Cannot add or update a child row: a foreign key constraint fails]
[type] => db_error
[user_info] => INSERT INTO civicrm_subscription_history (contact_id , group_id , date , method , status , tracking ) VALUES ( 0 , 1 , 20060110130916 , 'Admin' , 'Added' , NULL ) [nativecode=1216 ** Cannot add or update a child row: a foreign key constraint fails]
[to_string] => [db_error: message="DB Error: constraint violation" code=-3 mode=callback callback=CRM_Core_Error::handle prefix="" info="INSERT INTO civicrm_subscription_history (contact_id , group_id , date , method , status , tracking ) VALUES ( 0 , 1 , 20060110130916 , 'Admin' , 'Added' , NULL ) [nativecode=1216 ** Cannot add or update a child row: a foreign key constraint fails]"]
)
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whereas if i add the same contacts in only one group, it works fine..

--rafi