Shouldn't work anyway.
http://www.tski.co.jp/baldio/patch/20011107.html
Added /targetgroupbuff. Type /targetgroupbuff on to activate, off to turn it off. When on, all group buff spells you cast will require a target but will affect everyone grouped (and in range) with that target, even if it is not your own group. When it is off your group buff spells will act normally.
This will only work with group buffs that have a duration, and will not affect heals, portals or change form spells.
Also the command required should be /targetgroupbuff, as /tgb wasn't added until January 8, 2002 (Luclin).
http://www.tski.co.jp/baldio/patch/20020108.html