Version R4.0.8 Exception when using /mm mobs spawn
Entity threw exception at world:3.8414878749916066,80.5269350175844,-3.6999719167382827 java.lang.NoClassDefFoundError: io/papermc/paper/entity/activation/ActivationRange at ModelEngine-R4.0.8.jar/com.ticxo.modelengine.v1_21_R3.entity.controller.LookControlWrapper.isActive(LookControlWrapper.java:147) ~[ModelEngine-R4.0.8.jar:?] at ModelEngine-R4.0.8.jar/com.ticxo.modelengine.v1_21_R3.entity.controller.LookControlWrapper.defaultTick(LookControlWrapper.java:83) ~[ModelEngine-R4.0.8.jar:?] at ModelEngine-R4.0.8.jar/com.ticxo.modelengine.v1_21_R3.entity.controller.LookControlWrapper.tick(LookControlWrapper.java:66) ~[ModelEngine-R4.0.8.jar:?] at net.minecraft.world.entity.Mob.serverAiStep(Mob.java:982) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.LivingEntity.aiStep(LivingEntity.java:3676) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.Mob.aiStep(Mob.java:710) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.monster.Monster.aiStep(Monster.java:45) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.monster.Zombie.aiStep(Zombie.java:307) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.LivingEntity.tick(LivingEntity.java:3385) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.Mob.tick(Mob.java:461) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.entity.monster.Zombie.tick(Zombie.java:300) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.level.ServerLevel.tickNonPassenger(ServerLevel.java:1374) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.level.Level.guardEntityTick(Level.java:1536) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.level.ServerLevel.lambda$tick$4(ServerLevel.java:834) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:39) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:816) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1923) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1711) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1370) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:344) ~[purpur-1.21.4.jar:1.21.4-2376-4bf1b98] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?] Caused by: java.lang.ClassNotFoundException: io.papermc.paper.entity.activation.ActivationRange ... 21 more