QtDBus: cannot relay signals from parent QObject

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QtDBus: cannot relay signals from parent QObject

hustfzt
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 when i compile the following code:
from openravepy import *
env = Environment()            #  create openrave environment
env.SetViewer('qtcoin')        # attach viewer (optional)
env.Load('data/lab1.env.xml')   # load a simple scene
robot = env.GetRobots()[0]      # get the first robot

I get the error:
QtDBus: cannot relay signals from parent QObject(0x7fd9c471ee90 "") unless they are emitted in the object's thread QThread(0x7fd9c400c850 ""). Current thread is QThread(0x2b91b40 "").
QtDBus: cannot relay signals from parent QObject(0x7fd9c471ee90 "") unless they are emitted in the object's thread QThread(0x7fd9c400c850 ""). Current thread is QThread(0x2b91b40 "").
2016-07-01 22:36:00,596 openrave [WARN] [qtcoinrave.cpp:80 DestroyPlugin] SoQt releasing all memory
Coin debug: socontexthandler_cleanup(): 4 context-bound resources not free'd before exit.
QThreadStorage: Thread 0x7fd9c400c850 exited after QThreadStorage 6 destroyed
QThreadStorage: Thread 0x7fd9c400c850 exited after QThreadStorage 5 destroyed
QThreadStorage: Thread 0x7fd9c400c850 exited after QThreadStorage 4 destroyed
QThreadStorage: Thread 0x7fd9c400c850 exited after QThreadStorage 3 destroyed
QThreadStorage: Thread 0x7fd9c400c850 exited after QThreadStorage 2 destroyed
QThreadStorage: Thread 0x7fd9c400c850 exited after QThreadStorage 1 destroyed

How to solve it? Thank you
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