does not have an associated coordinate variable

Hi NCL users,

I was trying to extract the data over an area for the calculation of wgt_areaave_Wrap and coming across with this error.

-------------------------------------------------------------------------------
fatal:Dimension (lon) of (newolr) does not have an associated coordinate variable
fatal:Execute: Error occurred at or near line 50 in file test_read.ncl
-------------------------------------------------------------------------------

How to go away with this error?

Below is the mesg. and the attached is the ncl script with file uploaded.

Regards,
Phani.

===========================================
 Copyright (C) 1995-2009 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 5.1.1
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.

Variable: olr
Type: float
Total Size: 887685120 bytes
            221921280 values
Number of Dimensions: 4
Dimensions and sizes: [time | 3612] x [toa | 1] x [latitude | 192] x [longitude | 320]
Coordinates:
            time: [ 0..3611]
            toa: [ 0.. 0]
            latitude: [39.92..-19.863]
            longitude: [40.064..139.911]
Number Of Attributes: 10
  long_name : Upward long wave radiation flux
  units : W/m**2
  _FillValue : 2e+20
  source : GRIB data
  name : ULWRF
  title : Upward long wave radiation flux
  date : 11/02/99
  time : 00:00
  valid_min : 74
  valid_max : 391

Variable: time
Type: double
Total Size: 28896 bytes
            3612 values
Number of Dimensions: 1
Dimensions and sizes: [time | 3612]
Coordinates:
            time: [ 0..3611]
Number Of Attributes: 2
  units : days since 1999-02-11 00:00:00
  calendar : standard

Variable: lat
Type: float
Total Size: 768 bytes
            192 values
Number of Dimensions: 1
Dimensions and sizes: [latitude | 192]
Coordinates:
            latitude: [39.92..-19.863]
Number Of Attributes: 3
  long_name : latitude
  units : degrees_north
  standard_name : latitude

Variable: lon
Type: float
Total Size: 1280 bytes
            320 values
Number of Dimensions: 1
Dimensions and sizes: [longitude | 320]
Coordinates:
            longitude: [40.064..139.911]
Number Of Attributes: 3
  long_name : longitude
  units : degrees_east
  standard_name : longitude
fatal:Dimension (lon) of (newolr) does not have an associated coordinate variable
fatal:Execute: Error occurred at or near line 50 in file test_read.ncl

===============================================================

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