Thank for the fast response. With your help, i finally found the problem and
made this following changes:

1) Update cturtle
2) Change this  command "from driver_base.msg import SensorLevels" in
MyStuff.cfg to "from dynamic_reconfigure.msg import SensorLevels"

Currently, there is no error or warning, I will try the program on Monday to
check whether it can work. 

With thanks,
Zhi Ping


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