londiste drop-node error

gistfile1.txt

[S] [hm@pg06 l3simple]$ sudo -u postgres londiste3 st3simple/st3_l3simple_db1.ini drop-node node2
2014-04-10 22:14:52,769 19253 ERROR Job st3_l3simple_leaf crashed: find_root_db: got loop: dbname=l3simple_db1
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/skytools/scripting.py", line 579, in run_func_safely
    r = func()
  File "/usr/local/lib/python2.7/dist-packages/skytools/adminscript.py", line 62, in work
    fn(*cmdargs)
  File "/usr/local/lib/python2.7/dist-packages/pgq/cascade/admin.py", line 659, in cmd_drop_node
    root_db = self.find_root_db()
  File "/usr/local/lib/python2.7/dist-packages/pgq/cascade/admin.py", line 365, in find_root_db
    raise Exception("find_root_db: got loop: %s" % loc)
Exception: find_root_db: got loop: dbname=l3simple_db1