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I am using explicit wait like below to check if element is clickable.WebDriverWait(driver, 30).until( expected_conditions.element_to_be_clickable((By.CSS_SELECTOR, "#search")))But I get error<class 'selenium.common.exceptions.WebDriverException'> Message: The command 'GET /session/.../displayed' was not found.If I use time.sleep() it works fine instead of explicir wait it works fine. I have initialized safari driver as from selenium.webdriver import Safari driver = Safari()Here is stacktraceFile "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/support/wait.py", line 71, in until value = method(self._driver) File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/support/expected_conditions.py", line 283, in __call__ element = visibility_of_element_located(self.locator)(driver) File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/support/expected_conditions.py", line 127, in __call__ return _element_if_visible(_find_element(driver, self.locator)) File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/support/expected_conditions.py", line 147, in _element_if_visible return element if element.is_displayed() == visibility else False File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/remote/webelement.py", line 490, in is_displayed return self._execute(Command.IS_ELEMENT_DISPLAYED)['value'] File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/remote/webelement.py", line 628, in _execute return self._parent.execute(command, params) File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/remote/webdriver.py", line 314, in execute self.error_handler.check_response(response) File "/Users/Library/Python/2.7/lib/python/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace)WebDriverException: Message: The command 'GET /session/7.../displayed' was not found.