SOLUTION!!!!
Go to your blockland folder, go into add-ons, delete gamemode_zombiemode, go on blockland, start a game, make sure ZAPT is enabled, start the server, go into brick menu, specical and there should be 2 pictures of a mob of zombies and 1 picture of a tank. select the first picture of the zombie mob and plant it down, wrench it, and select zombie standard. It will say, "The Standard will spawn when the director cho0ses." Then make the minigame. Make the gamemode ZAPT Game Mode. Also make sure that ZAPT is enabled in the minigame. Make the zapt gametype Infection. Start the minigame and there you go! For more help, talk to me on the irc and if you don't have RTB, then private message me on blockland forums. Hope I helped!