Default service already exists for type 'mining'

[Lucidi0us]

root@localhost:/opt/solo/stratum-mining# twistd -ny launcher.tac -l -
2013-11-18 17:51:37,117 INFO mining # Connecting to bitcoind...
2013-11-18 17:51:37,157 INFO proxy # C extension for midstate not available. Using default implementation instead.
Unhandled Error
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/application/app.py", line 652, in run
runApp(config)
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/scripts/twistd.py", line 23, in runApp
_SomeApplicationRunner(config).run()
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/application/app.py", line 386, in run
self.application = self.createOrGetApplication()
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/application/app.py", line 451, in createOrGetApplication
application = getApplication(self.config, passphrase)
--- ---
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/application/app.py", line 462, in getApplication
application = service.loadApplication(filename, style, passphrase)
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/application/service.py", line 405, in loadApplication
application = sob.loadValueFromFile(filename, 'application', passphrase)
File "/usr/local/lib/python2.7/dist-packages/Twisted-12.3.0-py2.7-linux-x86_64.egg/twisted/persisted/sob.py", line 210, in loadValueFromFile
exec fileObj in d, d
File "launcher.tac", line 43, in
from lib.getwork_proxy import GetworkProxy
File "/opt/solo/stratum-mining/lib/getwork_proxy.py", line 11, in
from mining_libs import client_service
File "/usr/local/lib/python2.7/dist-packages/stratum_mining_proxy-1.3.0-py2.7.egg/mining_libs/client_service.py", line 8, in
import stratum_listener
File "/usr/local/lib/python2.7/dist-packages/stratum_mining_proxy-1.3.0-py2.7.egg/mining_libs/stratum_listener.py", line 69, in
class StratumProxyService(GenericService):
File "/usr/local/lib/python2.7/dist-packages/stratum-0.2.11-py2.7.egg/stratum/services.py", line 224, in init
ServiceFactory.register_service(cls, _dict)
File "/usr/local/lib/python2.7/dist-packages/stratum-0.2.11-py2.7.egg/stratum/services.py", line 135, in register_service
raise custom_exceptions.DefaultServiceAlreadyExistException("Default service already exists for type '%s'" % service_type)
stratum.custom_exceptions.DefaultServiceAlreadyExistException: Default service already exists for type 'mining'

Failed to load application: Default service already exists for type 'mining'