My game always crash when the flying entities from AOA3 appeared.
The crash report：
at net.tslat.aoa3.entity.base.ai.mob.EntityAIFlyingRangedAttack.updateTask(EntityAIFlyingRangedAttack.java:33)
at net.minecraft.entity.ai.EntityAITasks.onUpdateTasks(SourceFile:129)
at net.minecraft.entity.EntityLiving.updateEntityActionState(EntityLiving.java:888)
at net.minecraft.entity.EntityLivingBase.onLivingUpdate(EntityLivingBase.java:2359)
at net.minecraft.entity.EntityLiving.onLivingUpdate(EntityLiving.java:678)
at net.minecraft.entity.EntityLivingBase.onUpdate(EntityLivingBase.java:2179)
at net.minecraft.entity.EntityLiving.onUpdate(EntityLiving.java:377)
at net.tslat.aoa3.entity.base.AoAFlyingRangedMob.onUpdate(AoAFlyingRangedMob.java:339)
at net.minecraft.world.World.updateEntityWithOptionalForce(World.java:1996)
at net.minecraft.world.WorldServer.updateEntityWithOptionalForce(WorldServer.java:832)
at net.minecraft.world.World.updateEntity(World.java:1958)
at net.minecraft.world.World.redirect$zbe000$updateEntity(World.java:4123)
at net.minecraft.world.World.updateEntities(World.java:1762)
at net.minecraft.world.WorldServer.updateEntities(WorldServer.java:613)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:767)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:279)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Unknown Source)

In the DS config, go to (server settings -> AI -> add null checks to AI) and add the AI class from the crash report: net.tslat.aoa3.entity.base.ai.mob.EntityAIFlyingRangedAttack

Then restart server (or client if on single player/LAN) and see if it fixes the issue

It got solved,thank U so much