I have noticed that it is not possible for players without the /spawnmob ability to progress past the "animal farm" challenge as they cannot be rewarded the animals from other challenges they need in order to complete the challenge. Once completing various other challenges the server is supposed to spawn certain animals for players, however when they complete the challenges they get the error: "I'm sorry, but you do not have permission to perform this command. Please contact the server administrator if you believe that this is in error." Please fix this to allow players to progress through island challenges!!
