bantracker django interface fails to validate models

[Arvind S Raj]

I ran "python manage.py runserver" and this was the error generated

Validating models...
Unhandled exception in thread started by <function inner_run at 0x1b6a230>
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/django/core/management/commands/runserver.py", line 48, in inner_run
    self.validate(display_num_errors=True)
  File "/usr/lib/pymodules/python2.6/django/core/management/base.py", line 253, in validate
    raise CommandError("One or more models did not validate:\n%s" % error_text)
django.core.management.base.CommandError: One or more models did not validate:
bt.ban: Accessor for field 'removed_by' clashes with related field 'Operator.removed_by'. Add a related_name argument to the definition for 'removed_by'.
bt.ban: Reverse query name for field 'removed_by' clashes with related field 'Operator.removed_by'. Add a related_name argument to the definition for 'removed_by'.
bt.mute: Accessor for field 'removed_by' clashes with related field 'Operator.removed_by'. Add a related_name argument to the definition for 'removed_by'.
bt.mute: Reverse query name for field 'removed_by' clashes with related field 'Operator.removed_by'. Add a related_name argument to the definition for 'removed_by'.

thought I should report it.