DBD::Pg::st execute failed: ERROR

[Khalil Foundy <..hidden..>]

Hi Guys sorry to bother you again,
But since this morning this error is causing me a real headache. Does any one knows what this is ? and how to get around it ? This error occurred  while trying to add a GL transaction.

DBD::Pg::st execute failed: ERROR:  duplicate key violates unique constraint "transactions_pkey"
Error! 
		INSERT INTO gl (reference, employee_id)
		     VALUES ('Tue May 29 11:50:13 20073929', (SELECT id FROM employee
		                       WHERE login = ?))
ERROR:  duplicate key violates unique constraint "transactions_pkey"




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