define: Data Request Warning

[Boyin Huang]

I try to define a new variable from temp (temperature) by the following
script:
---------------------------------
'reinit'
'open /gpfsuser/g03/wx52yx/godas/clim/month/mnth.clim.temp.1992-
2003.harm3.ctl'
'set lon  30 390'
'set lev  0 300'
'set t 1 '
'set lat 0'
'define var= ave(temp,t=1,t=12,1)'
'd var'
-------------------------------

which generated the right figure, but also prompts many warnings:
Data Request Warning:  Request beyond file limits

Is there anything wrong with the defines?

I am using grads 1.8SL11.

Thanks.