cannot read a netCDF 4 file with group

Dear all,

I have a data file in netCDF 4, in_grp.nc (see the attachment). And there
are several groups in the file.

However, I cannot read it by addfile or ncl_filedump. I am using NCL 6.0.0
on Ubuntu 12.04 (32bit).

The error message is:
ncdiminq: ncid 65536: NetCDF: Invalid dimension ID or name
ncdiminq: ncid 65536: NetCDF: Invalid dimension ID or name
ncdiminq: ncid 65536: NetCDF: Invalid dimension ID or name
ncdiminq: ncid 65536: NetCDF: Invalid dimension ID or name
Segmentation fault (core dumped)

Here is the structure of this file given by ncdump:
netcdf in_grp {
dimensions:
    lat = 2 ;
    lev = 3 ;
    lon = 4 ;
    time = UNLIMITED ; // (10 currently)
variables:
    float lat(lat) ;
        lat:long_name = "Latitude (typically midpoints)" ;
        lat:units = "degrees_north" ;
    float lev(lev) ;
        lev:purpose = "Monotonically increasing coordinate pressure" ;
        lev:units = "hybrid_sigma_pressure" ;
        lev:positive = "down" ;
        lev:A_var = "hyam" ;
        lev:B_var = "hybm" ;
        lev:P0_var = "P0" ;
        lev:PS_var = "PS" ;
        lev:bounds = "ilev" ;
    float lon(lon) ;
        lon:long_name = "Longitude (typically midpoints)" ;
        lon:units = "degrees_east" ;
    double time(time) ;
    float scl ;

// global attributes:
        :Conventions = "CF-1.0" ;
        :history = "History global attribute.\n" ;
        :julian_day = 200000.04 ;
        :RCS_Header = "$Header$" ;
data:

 lat = -90, 90 ;

 lev = 100, 500, 1000 ;

 lon = 0, 90, 180, 270 ;

 time = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ;

 scl = 1 ;

group: level_1_group_1 {
  variables:
      double time(time) ;
      float lat(lat) ;
      float lev(lev) ;
      float lon(lon) ;
          lon:long_name = "level_1_group_1 Longitude (typically midpoints)"
;
          lon:units = "level_1_group_1 degrees_east" ;
      float scl ;
  data:

   time = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ;

   lat = -90, 90 ;

   lev = 100, 500, 1000 ;

   lon = 0, 90, 180, 270 ;

   scl = 1.1 ;

  group: level_2_group_1 {
    variables:
        float scl ;
    data:

     scl = 1.1 ;
    } // group level_2_group_1
  } // group level_1_group_1

group: level_1_group_2 {
  variables:
      double time(time) ;
      float scl ;
  data:

   time = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ;

   scl = 1.2 ;
  } // group level_1_group_2

group: level_1_group_3 {
  dimensions:
      rlev = 3 ;
      time2 = UNLIMITED ; // (20 currently)
  variables:
      float rz(rlev) ;
      double time2(time2) ;
      float scl ;

  // group attributes:
          :level_1_group_3_global_
attribute = "level_1_group_3_global_attribute" ;
  data:

   rz = 0, 5000, 17000 ;

   time2 = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20 ;

   scl = 1.3 ;
  } // group level_1_group_3

group: level_1_group_4 {

  group: level_2_group_4 {
    dimensions:
        rlev = 3 ;
    variables:
        float rz(rlev) ;
    data:

     rz = 0, 5000, 17000 ;

    group: level_3_group_4 {
      dimensions:
          time2 = UNLIMITED ; // (5 currently)
          time3 = UNLIMITED ; // (6 currently)
      variables:
          double time2(time2) ;
          double time3(time3) ;
      data:

       time2 = 1, 2, 3, 4, 5 ;

       time3 = 1, 2, 3, 4, 5, 6 ;
      } // group level_3_group_4
    } // group level_2_group_4
  } // group level_1_group_4

group: level_1_group_5 {

  group: level_2_group_5 {

    group: level_3_group_5 {
      } // group level_3_group_5
    } // group level_2_group_5
  } // group level_1_group_5
}

Thank you!

Best regards,
Wenshan

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