File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py", line 60, in click
self._execute(Command.CLICK_ELEMENT)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webelement.py", line 370, in _execute
return self._parent.execute(command, params)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 173, in execute
self.error_handler.check_response(response)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/appium/webdriver/errorhandler.py", line 29, in check_response
raise wde
WebDriverException: Message: u'An unknown server-side error occurred while processing the command.'