[31Mar2021 21:56:47.745] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: Encountered an unexpected exception
net.minecraft.crash.ReportedException: Ticking entity
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:855) ~[?:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?]
at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?]
at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_271]
Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/Minecraft for invalid dist DEDICATED_SERVER
at net.minecraftforge.fml.loading.RuntimeDistCleaner.processClassWithFlags(RuntimeDistCleaner.java:71) ~[forge-1.16.5-36.1.0.jar:36.1]
at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:85) ~[modlauncher-8.0.9.jar:?]
at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-8.0.9.jar:?]
at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:265) ~[modlauncher-8.0.9.jar:?]
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:136) ~[modlauncher-8.0.9.jar:?]
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-8.0.9.jar:?]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271]
at maninhouse.epicfight.capabilities.entity.MobData.getAttackDirectionPitch(MobData.java:120) ~[epicfight:1.0]
at maninhouse.epicfight.animation.types.attack.AttackAnimation.lambda$getPoseByTime$2(AttackAnimation.java:210) ~[epicfight:1.0]
at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_271]
at maninhouse.epicfight.animation.types.attack.AttackAnimation.getPoseByTime(AttackAnimation.java:209) ~[epicfight:1.0]
at maninhouse.epicfight.animation.types.DynamicAnimation.getLinkAnimation(DynamicAnimation.java:72) ~[epicfight:1.0]
at maninhouse.epicfight.animation.AnimatorServer.playAnimation(AnimatorServer.java:36) ~[epicfight:1.0]
at maninhouse.epicfight.entity.ai.AttackPatternGoal.func_75246_d(AttackPatternGoal.java:87) ~[epicfight:1.0]
at net.minecraft.entity.ai.goal.PrioritizedGoal.func_75246_d(SourceFile:55) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.ReferencePipeline$2$1.accept(Unknown Source) ~[?:1.8.0_271]
at java.util.Iterator.forEachRemaining(Unknown Source) ~[?:1.8.0_271]
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.AbstractPipeline.copyInto(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.AbstractPipeline.evaluate(Unknown Source) ~[?:1.8.0_271]
at java.util.stream.ReferencePipeline.forEach(Unknown Source) ~[?:1.8.0_271]
at net.minecraft.entity.ai.goal.GoalSelector.func_75774_a(SourceFile:88) ~[?:?]
at net.minecraft.entity.MobEntity.func_70626_be(MobEntity.java:682) ~[?:?]
at net.minecraft.entity.LivingEntity.func_70636_d(LivingEntity.java:2411) ~[?:?]
at net.minecraft.entity.MobEntity.func_70636_d(MobEntity.java:488) ~[?:?]
at net.minecraft.entity.monster.MonsterEntity.func_70636_d(SourceFile:43) ~[?:?]
at net.minecraft.entity.monster.ZombieEntity.func_70636_d(ZombieEntity.java:231) ~[?:?]
at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2158) ~[?:?]
at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?]
at net.minecraft.entity.monster.ZombieEntity.func_70071_h_(ZombieEntity.java:205) ~[?:?]
at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?]
at net.minecraft.world.World.func_217390_a(World.java:554) ~[?:?]
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:851) ~[?:?]
... 5 more

I'm fixing this bug now😭. sorry!