Every time I load up a map with Widows Wine I get an error saying
"Server script compile error unknown function if ( self.enemy thread maps\_zombiemode_perks::harrybo21_perks_widows_wine_explode_on_melee())"

This doesn't happen on a map I made either it happens on every custom zombies map I load that has Widows Wine. If there is a solution please help because I recently bought the game on steam and the only reason I actually bought it was to play zombies maps.

Are you using his preedited stock script and did compile your mapname_patch.ff.