SET EXPLAIN (Msg File Prob)

Hi Fellow Users, Can any one pull me out of dark about why do I get error -581 when I use 'SET EXPLAIN ON'. The error explantion is -581 Error loading message file. This SET EXPLAIN statement could not be completed because the database server was unable to find the file of message templates it uses when preparing explanatory output. Consult with the person who installed the Informix software. I am not sure about what Message Templates. Any help in the matter will be appreciated. HP-UX/9.0 INFORMIX ONLINE 5.01 Rgds, Anand e-mail : anand@sin-co.sin-ro.dhl.com ************************************************************************* You cannot do wrong without suffering wrong *************************************************************************