h5toh4 errors "class not found" in convert_attr

I'm trying to convert this H5 (created with IDL's netCDF library and
NETCDF4_FORMAT option set):
http://dl.dropbox.com/u/9834776/j5f1610221.h5

to an HDF4 file. This is the resulting file:
http://dl.dropbox.com/u/9834776/j5f1610221.h4

Here are a bunch of errors; should they be ignored?:

wicklow:data robr$ ~/packages/h4toh5-2.1.1-macosxUB/bin/h5toh4 j5f1610221.h5
j5f1610221.h4
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: 9 class not found
Error detected in convert_attr() [h5toh4.c line 2169]
Error: H5Sget_simple_extent_npoints() returned inappropriate value.
Error detected in convert_dataset() [h5toh4.c line 1237]
Error: convert_dataset did not work for Time
Error detected in convert_all() [h5toh4.c line 2466]
Warning: H5T_COMPOUND attribute not implemented.
Warning: H5T_COMPOUND attribute not implemented.
wicklow:data robr$

ยทยทยท

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