plot wrf output by NCL

Hi,

I want to plot convective precipitation simulated by WRF by NCL. WRF output RAINC (two dimensions), and
XLAT (two dimensions), XLONG (two dimensions). I wrote the NCL script to plot the rain. The error messages like:

---------------------------------
fatal:Coordinate variables must have one dimension only
fatal:No coordinate variable exists for dimension (lat) in variable (raincc)
fatal:Execute: Error occurred at or near line 23 in file wrf.ncl

fatal:Coordinate variables must have one dimension only
fatal:No coordinate variable exists for dimension (lon) in variable (raincc)
fatal:Execute: Error occurred at or near line 24 in file wrf.ncl

----------------------------------

Attached is the script I used. Thanks very much for any help!

Chao

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