what is wrong with my script

[du hui <bjduhui@xxxxxxxxxxx>]

Hi, When I defined axis there is something wrong. I think the syntax should 
be right. 
the following is the script and the error messages.
Could anyone point out where the trouble is?
Thanks a lot

USE mm5_lon180.ctrl.nc
DEFINE AXIS/X=47.5E:177.5E:2.5 xnew
DEFINE AXIS/Y=22.5N:22.5S:2.5 ynew

FILL/x=xnew/y=ynew/z=200/l=1 unew
**ERROR: command syntax: xnew
CONTOUR/FILL/x=xnew/y=ynew/z=200/l=1 unew
Command file, command group, or REPEAT execution aborted

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