XSetPlaneMask can generate BadAlloc and BadGC errors. XSetForeground can generate BadAlloc and BadGC errors. XSetBackground can generate BadAlloc and BadGC errors. The server failed to allocate the requested resource or server memory. A value for a GContext argument does not name a defined GContext.
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.