common.exceptions

Exceptions that may happen in all the webdriver code.

Module Contents

Classes

WebDriverException(self,msg=None,screen=None,stacktrace=None) Base webdriver exception.
ErrorInResponseException(self,response,msg) Thrown when an error has occurred on the server side.
InvalidSwitchToTargetException() Thrown when frame or window target to be switched doesn’t exist.
NoSuchFrameException() Thrown when frame target to be switched doesn’t exist.
NoSuchWindowException() Thrown when window target to be switched doesn’t exist.
NoSuchElementException() Thrown when element could not be found.
NoSuchAttributeException() Thrown when the attribute of element could not be found.
StaleElementReferenceException() Thrown when a reference to an element is now “stale”.
InvalidElementStateException()
UnexpectedAlertPresentException(self,msg=None,screen=None,stacktrace=None,alert_text=None) Thrown when an unexpected alert is appeared.
NoAlertPresentException() Thrown when switching to no presented alert.
ElementNotVisibleException() Thrown when an element is present on the DOM, but
ElementNotInteractableException() Thrown when an element is present in the DOM but interactions
ElementNotSelectableException() Thrown when trying to select an unselectable element.
InvalidCookieDomainException() Thrown when attempting to add a cookie under a different domain
UnableToSetCookieException() Thrown when a driver fails to set a cookie.
RemoteDriverServerException()
TimeoutException() Thrown when a command does not complete in enough time.
MoveTargetOutOfBoundsException() Thrown when the target provided to the ActionsChains move()
UnexpectedTagNameException() Thrown when a support class did not get an expected web element.
InvalidSelectorException() Thrown when the selector which is used to find an element does not return
ImeNotAvailableException() Thrown when IME support is not available. This exception is thrown for every IME-related
ImeActivationFailedException() Thrown when activating an IME engine has failed.
InvalidArgumentException() The arguments passed to a command are either invalid or malformed.
JavascriptException() An error occurred while executing JavaScript supplied by the user.
NoSuchCookieException() No cookie matching the given path name was found amongst the associated cookies of the
ScreenshotException() A screen capture was made impossible.
ElementClickInterceptedException() The Element Click command could not be completed because the element receiving the events
InsecureCertificateException() Navigation caused the user agent to hit a certificate warning, which is usually the result
InvalidCoordinatesException() The coordinates provided to an interactions operation are invalid.
InvalidSessionIdException() Occurs if the given session id is not in the list of active sessions, meaning the session
SessionNotCreatedException() A new session could not be created.
UnknownMethodException() The requested command matched a known URL but did not match an method for that URL.
class WebDriverException(msg=None, screen=None, stacktrace=None)

Base webdriver exception.

__init__(msg=None, screen=None, stacktrace=None)
__str__()
class ErrorInResponseException(response, msg)

Thrown when an error has occurred on the server side.

This may happen when communicating with the firefox extension or the remote driver server.

__init__(response, msg)
class InvalidSwitchToTargetException

Thrown when frame or window target to be switched doesn’t exist.

class NoSuchFrameException

Thrown when frame target to be switched doesn’t exist.

class NoSuchWindowException

Thrown when window target to be switched doesn’t exist.

To find the current set of active window handles, you can get a list of the active window handles in the following way:

print driver.window_handles
class NoSuchElementException

Thrown when element could not be found.

If you encounter this exception, you may want to check the following:
  • Check your selector used in your find_by…
  • Element may not yet be on the screen at the time of the find operation, (webpage is still loading) see selenium.webdriver.support.wait.WebDriverWait() for how to write a wait wrapper to wait for an element to appear.
class NoSuchAttributeException

Thrown when the attribute of element could not be found.

You may want to check if the attribute exists in the particular browser you are testing against. Some browsers may have different property names for the same property. (IE8’s .innerText vs. Firefox .textContent)

class StaleElementReferenceException

Thrown when a reference to an element is now “stale”.

Stale means the element no longer appears on the DOM of the page.

Possible causes of StaleElementReferenceException include, but not limited to:
  • You are no longer on the same page, or the page may have refreshed since the element was located.
  • The element may have been removed and re-added to the screen, since it was located. Such as an element being relocated. This can happen typically with a javascript framework when values are updated and the node is rebuilt.
  • Element may have been inside an iframe or another context which was refreshed.
class InvalidElementStateException
class UnexpectedAlertPresentException(msg=None, screen=None, stacktrace=None, alert_text=None)

Thrown when an unexpected alert is appeared.

Usually raised when when an expected modal is blocking webdriver form executing any more commands.

__init__(msg=None, screen=None, stacktrace=None, alert_text=None)
__str__()
class NoAlertPresentException

Thrown when switching to no presented alert.

This can be caused by calling an operation on the Alert() class when an alert is not yet on the screen.

class ElementNotVisibleException

Thrown when an element is present on the DOM, but it is not visible, and so is not able to be interacted with.

Most commonly encountered when trying to click or read text of an element that is hidden from view.

class ElementNotInteractableException

Thrown when an element is present in the DOM but interactions with that element will hit another element do to paint order

class ElementNotSelectableException

Thrown when trying to select an unselectable element.

For example, selecting a ‘script’ element.

class InvalidCookieDomainException

Thrown when attempting to add a cookie under a different domain than the current URL.

class UnableToSetCookieException

Thrown when a driver fails to set a cookie.

class RemoteDriverServerException
class TimeoutException

Thrown when a command does not complete in enough time.

class MoveTargetOutOfBoundsException

Thrown when the target provided to the ActionsChains move() method is invalid, i.e. out of document.

class UnexpectedTagNameException

Thrown when a support class did not get an expected web element.

class InvalidSelectorException

Thrown when the selector which is used to find an element does not return a WebElement. Currently this only happens when the selector is an xpath expression and it is either syntactically invalid (i.e. it is not a xpath expression) or the expression does not select WebElements (e.g. “count(//input)”).

class ImeNotAvailableException

Thrown when IME support is not available. This exception is thrown for every IME-related method call if IME support is not available on the machine.

class ImeActivationFailedException

Thrown when activating an IME engine has failed.

class InvalidArgumentException

The arguments passed to a command are either invalid or malformed.

class JavascriptException

An error occurred while executing JavaScript supplied by the user.

class NoSuchCookieException

No cookie matching the given path name was found amongst the associated cookies of the current browsing context’s active document.

class ScreenshotException

A screen capture was made impossible.

class ElementClickInterceptedException

The Element Click command could not be completed because the element receiving the events is obscuring the element that was requested clicked.

class InsecureCertificateException

Navigation caused the user agent to hit a certificate warning, which is usually the result of an expired or invalid TLS certificate.

class InvalidCoordinatesException

The coordinates provided to an interactions operation are invalid.

class InvalidSessionIdException

Occurs if the given session id is not in the list of active sessions, meaning the session either does not exist or that it’s not active.

class SessionNotCreatedException

A new session could not be created.

class UnknownMethodException

The requested command matched a known URL but did not match an method for that URL.