If no such window exists or if the window is an ancestor of the focus window and InputFocus was originally specified as the destination, the event is not sent to any clients. XSendExtensionEvent returns zero if the conversion to wire protocol format failed and returns nonzero otherwise. An invalid device was specified. The specified device does not exist or has not been opened by this client via XOpenInputDevice . This error may also occur if the specified device is the X keyboard or X pointer device.
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error. BadWindow A value for a Window argument does not name a defined Window.