Could not create service named

Hi ,
I am new about Appium.But I have about 8 years on programming.
I am using Appium 1.5.3 on mac, the server is starting and running well.
But the python test can not execute right,error is about ‘selenium.common.exceptions.NoSuchElementException: Message: An element could not be located on the page using the given search parameters.’ and Appium server logs shows error "[iOSLog] [IOS_SYSLOG_ROW] Oct 28 13:10:27 TisedeMacBook-Pro-2 DTServiceHub[22369]: Could not create service named

mac 10.11.6 
xcode 7.3
python 2.7
appium 1.5.3

Anybody has any idea about this?