export / import errors from postgresql to mysql

Hello all,
  I'm trying to convert from the postgresql backend to the mysql backend.
  I get the following error, using roundup 1.4.20:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/roundup/admin.py", line 1481, in 
run_command
    ret = function(args[1:])
  File "/usr/lib/python2.7/dist-packages/roundup/admin.py", line 1257, in 
do_import
    nodeid = cl.import_list(file_props, r)
  File "/usr/lib/python2.7/dist-packages/roundup/backends/rdbms_common.py", 
line 2837, in import_list
    prop = properties[propname]
KeyError: 'group'

Any ideas?
Thanks, Chad.

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