Ultimate Unicorn

[ZET3R]

Hello, I found this mod and I loved it too much and I tried to use it on my server to play with my friends and I install the mod on the server like any other mod (on my client too), the server starts without problems but when I try to generate I can't make the unicorn, but this mod also adds swords and armor and I can use them.
And the console always pulls this out when I try to pull a unicorn out.
Here's the link and the version is 1.12.2

https://www.curseforge.com/minecraft/mc-mods/wings-horns-hooves-the-ultimate-unicorn-mod

Caused by: java.lang.AssertionError: Unknown entity class com.hackshop.ultimate_unicorn.mobs.EntityPegasus: EntityPegasus['Pegasus'/560, uuid='526a4117-f36b-4087-a5c2-48dd08986da3', l='world', x=0.00, y=0.00, z=0.00, cx=0, cd=0, tl=0, v=false, d=false]
at org.bukkit.craftbukkit.v1_12_R1.entity.CraftEntity.getEntity(CraftEntity.java:302) ~[CraftEntity.class:cda918c]
at net.minecraft.entity.Entity.getBukkitEntity(Entity.java:124) ~[vg.class:?]
at net.minecraft.inventory.ContainerHorseChest.<init>(ContainerHorseChest.java:21) ~[agg.class:?]
at net.minecraft.entity.passive.AbstractHorse.func_110226_cD(AbstractHorse.java:298) ~[aao.class:?]
at net.minecraft.entity.passive.AbstractHorse.<init>(AbstractHorse.java:100) ~[aao.class:?]
at net.minecraft.entity.passive.AbstractChestHorse.<init>(AbstractChestHorse.java:29) ~[aan.class:?]
at com.hackshop.ultimate_unicorn.mobs.EntityMagicalHorse.<init>(EntityMagicalHorse.java:434) ~[EntityMagicalHorse.class:?]
at com.hackshop.ultimate_unicorn.mobs.EntityPegasus.<init>(EntityPegasus.java:17) ~[EntityPegasus.class:?]
... 26 more

 

[LoGaL]

Why you report your problem here and not to the guy making the mod?

 

[ZET3R]

Why you report your problem here and not to the guy making the mod?

Because he's no event respond the email and the last time that he was online on twitch it was last december