Mlaunch timeout

When i try to run mlaunch to launch the cluster, it dies on timeout, and the only way i can run the script again is rebooting the server. Icould not find the reason why this timeout happen :

root@FBSD:/usr/home/sdavicco # mlaunch init --sharded 3 --replicaset --nodes 3 --config 3 --auth
launching: "mongod" on port 27018
launching: "mongod" on port 27019
launching: "mongod" on port 27020
launching: "mongod" on port 27021
launching: "mongod" on port 27022
launching: "mongod" on port 27023
launching: "mongod" on port 27024
launching: "mongod" on port 27025
launching: "mongod" on port 27026
launching: config server on port 27027
launching: config server on port 27028
launching: config server on port 27029
replica set 'configRepl' initialized.
replica set 'shard01' initialized.
replica set 'shard02' initialized.
replica set 'shard03' initialized.
launching: mongos on port 27017
adding shards. can take up to 30 seconds...
Traceback (most recent call last):
  File "/usr/local/bin/mlaunch", line 11, in <module>
    load_entry_point('mtools==1.5.3.dev0', 'console_scripts', 'mlaunch')()
  File "/usr/local/lib/python2.7/site-packages/mtools-1.5.3.dev0-py2.7.egg/mtools/mlaunch/mlaunch.py", line 2068, in main
    tool.run()
  File "/usr/local/lib/python2.7/site-packages/mtools-1.5.3.dev0-py2.7.egg/mtools/mlaunch/mlaunch.py", line 542, in run
    getattr(self, self.args['command'])()
  File "/usr/local/lib/python2.7/site-packages/mtools-1.5.3.dev0-py2.7.egg/mtools/mlaunch/mlaunch.py", line 762, in init
    roles=roles)
  File "/usr/local/lib/python2.7/site-packages/mtools-1.5.3.dev0-py2.7.egg/mtools/mlaunch/mlaunch.py", line 1710, in _add_user
    raise e
pymongo.errors.OperationFailure: Operation timed out

@ sdavicco

Sorry, but what Lab or Quiz are you trying to do?