The returned contents of visible regions of inferiors of a different depth than the specified window's depth are also undefined. The pointer cursor image is not included in the returned contents. A value for a Drawable argument does not name a defined Window or Pixmap. An InputOnly window is used as a Drawable. Some argument or pair of arguments has the correct type and range but fails to match in some other way required by the request.
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.