invalidid error ( Display Postscript )

indicates that an invalid identifier has been presented to a window system specific operator. In each integration of the Display PostScript system with a window system, there is a collection of window system specific operators. The operands of such operators are usually integers that identify windows and other objects that exist outside the PostScript language. This error occurs when the operand does not identify a valid object. It is generated only by window system specific operators and not by any standard operator.

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