GMOD ERROR: the Source Engine's error message as a desk object, in letters that stand on their own. Printed in red PLA, in two sizes. What this ERROR means The Source Engine shows ERROR wherever a model is missing: the red word every Garry's Mod player has had pop up mid-round. The placeholder turned into an in-joke of its own a long time ago. Here it is the five letters as an object: they stand up without a base, on a desk, on a shelf or on top of the monitor. Two sizes, red PLA The small one measures 7 × 9.5 × 2.5 cm, the large one 14.5 × 10.5 × 3.3 cm. The red isn't painted on: the piece is printed straight out of red PLA, and the print layers are left visible across the faces, which is what gives it its look. It arrives in one piece, with nothing to assemble. What players ask about the GMOD ERROR What is the ERROR in Garry's Mod? It's what the Source Engine shows when a model is missing. Plenty of people search for it as the error sign; here it is the word itself, in printed letters. Which size should I take? The small one sits next to the keyboard; the large one fills a shelf and reads from across the room.