warning:Dimension (0) has not been defined

Hi:
I am not understanding why the function dim_avg_n_Wrap gives me the warning:
warning:Dimension (0) has not been defined

In my ncl script, I have:
tempP_avgTime = dim_avg_n_Wrap(tempP,0)

where tempP is defined as

Variable: tempP
Type: double
Total Size: 365708736 bytes
             45713592 values
Number of Dimensions: 3
Dimensions and sizes: [36] x [X | 31] x [dim0 | 40962]
Coordinates:
             X: [1000..15]
Number Of Attributes: 1
   _FillValue : 9.969209968386869e+36

36 is time, 31 is the number of levels and 40962 is the number of cells.
tempP is an array on fixed pressure levels that was itself obtained with
the function
tempP(iFile,:,:) = transpose(int2p_n_Wrap(pres,temp,pFixed,linlog,1))

Since I later plan to do longer time averages, I would like to
understand this warning first.
Thanks,

Laura

-- 
!----------------------------------------------------
  Laura D. Fowler
  Mesoscale and Microscale Meteorology Division (MMM)
  National Center for Atmospheric Research
  P.O. Box 3000, Boulder CO 80307-3000
  e-mail: laura@ucar.edu
  phone : 303-497-1628
!----------------------------------------------------
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