In appium 1.6, self.driver.tap () cannot work

in appium 1.6, self.driver.tap () cannot work

the env is: xcode8, appium 1.6.1 beta

script like this: self.driver.tap([(134.3333333333333,111.5)])

when run , the error occurs:
File “/Library/Python/2.7/site-packages/appium/webdriver/webdriver.py”, line 203, in tap action.perform() File “/Library/Python/2.7/site-packages/appium/webdriver/common/touch_action.py”, line 94, in perform self._driver.execute(Command.TOUCH_ACTION, params) File “/Library/Python/2.7/site-packages/selenium-3.0.1-py2.7.egg/selenium/webdriver/remote/webdriver.py”, line 236, in execute self.error_handler.check_response(response) File “/Library/Python/2.7/site-packages/appium/webdriver/errorhandler.py”, line 29, in check_response raise wde WebDriverException: Message: An unknown server-side error occurred while processing the command. Original error: Unhandled endpoint: /session/321CA492-D9ED-414B-9B2A-A9695B4E2CDA/tap – http://localhost:8100/ with parameters { wildcards = ( “session/321CA492-D9ED-414B-9B2A-A9695B4E2CDA/tap” ); }

can somebody give some help?
Many thanks!