Could someone Help?

Hi:

I am having a trouble when I insert values to a table, could someone figure out the below error code:

ERROR at line 1:
ORA-00001: Message 1 not found; No message file for product=RDBMS72, facility=ORA; arguments:
[ISOM6750] [CONT_PK_EMPNO_CUSTID_CONT_DATE] Thanks in advance, your help is greatly appreiated!

-- 
Sincerely,


Benjamin Tay
=======================
A New RDBMS Learner
****************/////000\\\\\