Post your current code. It is most likely a typo. Keep in mind that when referencing global variables in JASS, or with Custom Script, you must use the correct syntax, with everything being case sensitive: 'udg_' is always put before any global variable in JASS/CS. '_' is used instead of spaces in variable names. So.. Creep X, would become: udg_Creep_X, in JASS/CS.