crontab error

Hi all

I try to schedule one job as a oracle user.But I got a error .Error code is

RC=1;

this is the command

exp system/passwd@test file=/export/home/oracle/test_`date +%d%m%y` owner=scott

if i excute through command prompt ,,,its run successfully

then i tried through at job.........its also perfect

but at that time of schedule i got this error code...

can anybody tell me,,, how resolve this one......

advance thanks to you.........

[498 byte] By [kyran55a] at [2007-11-26 19:40:37]