Transaction ended in the trigger. The batch has been aborted. (MSSQLServer, Error number: 3609)

I have setup trasaction replication with a remote distribution.
         SQL Server 2000   (The  publisher)
         SQL Server 2008   (The remote ditributor)
         SQL Server 2008  (The subscriber)
Non-trushted environment.

The setup was completed with no errors.  One day, the developers need to update the applications, so they dropped my replications.

Then,  I tested out my trasaction replication with Northwind database as Publisher in SQL 2000.  
When I run the initial snapshot, I received errors of:

Command attempted:

create procedure sp_MSins_Categories
@c1 int,
@c2 nvarchar(15),
@c3 ntext,
@c4 image
as
begin
insert into [Categories](
[CategoryID],
[CategoryName],
[Description],
[Picture]
) values (
@c1,
@c2,
@c3,
@c4 )
end

(Transaction sequence number: 0x0000001D00000152001800000001, Command ID: 6)

The transaction ended in the trigger. The batch has been aborted. (Source: MSSQLServer, Error number: 3609)
Get help: http://help/3609

The transaction ended in the trigger. The batch has been aborted. (Source: MSSQLServer, Error number: 3609)
Get help: http://help/3609


I am not familiar with those errors.  Can anyone help and advice?

I suspected the developers have implemented some custome triggers that will prevent the replication to be setup.

Thanks,
Edwin