plot T2 from 2 wrfout

I try to plot T2 from differences 2 wrfout but i get error " fatal:Number of subscripts do not match number of dimensions of variable,(3) Subscripts used, (2) Subscripts expected "
fatal:["Execute.c":7556]:Execute: Error occurred at or near line 97 in file plotdiff.ncl "

Could someone help me, please !!

--Royan

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