Undefined identifier: (gsn_csm_contour_mp_ce) is undefined, can'tcontinue

Hello everyone,
    I have occured an strange error. I have loaded some ncl files as follow

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl"

   But I have got an error message as

fatal:Undefined identifier: (gsn_csm_contour_mp_ce) is undefined, can't
continue
fatal:["Execute.c":8128]:Execute: Error occurred at or near line 323 in
file ESMF_FVCOM_to_rect.ncl

   Before the line 323, which is "contour =
gsn_csm_contour_mp_ce(wks,speed,res)", I have used " vector =
gsn_csm_vector_scalar_map_ce(wks,u_regrid,v_regrid,speed,res) ", it
looks OK.

   Why I get such error messages? Anyone can tell me? Thanks.

-- 
Xueming Zhu 朱学明
Key Laboratory of Research on Marine Hazards Forecasting(LoMF),SOA
National Marine Environmental Forecasting Center(NMEFC)
No.8, Dahuisi Road, Haidian District, Beijing , 100081
People's Republic of China
Tel:+86-10-82481923
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