sql server error

I'm getting an error i don't understand while attempting to run a simple insert

Server: Msg 2758, Level 16, State 1, Procedure Memberships_ITrig, Line 20
[COLOR="Red"]RAISERROR could not locate entry for error 778504 in sysmessages.[/COLOR]

Code (markup):

the table is memberships
with columns : group_id (int 4), contact_id (int 4), address_flag (bit 1), admin_flag (bit 1), private (bit 1), hold (bit 1), title (varchar 40), archived (tinyint 1)

contact_id and group_id form the primary key

Here's the statement

insert into memberships (group_id, contact_id) values (16133, 370568)

Code (markup):

I can't find the procedure Memberships_ITrig anywhere, i'm assuming some system procedure is creating this while it's running or something of that sort.

I've also tried insert statements assigning values for all of fields but got the same error.

 

Ask server administrator or hire someone with sql knowledge

 

yea good luck in finding some one with SQL knowledge lol.
server admin is your best bet though i agree. they should be able to sort that problem out