java.lang.NoSuchFieldError: END_PORTAL_FRAME
at com.onarandombox.MultiverseCore.listeners.MVPortalListener.portalForm(MVPortalListener.java:74) ~[?:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor22.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:61) ~[EventExecutor.class:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:77) ~[TimedEventExecutor.class:?]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:66) ~[RegisteredListener.class:?]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:484) ~[SimplePluginManager.class:?]
at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:331) ~[CraftEventFactory.class:?]
at net.minecraft.server.management.PlayerInteractionManager.func_187251_a(PlayerInteractionManager.java:501) ~[or.class:?]
at net.minecraft.network.NetHandlerPlayServer.func_184337_a(NetHandlerPlayServer.java:1150) ~[pa.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(CPacketPlayerTryUseItemOnBlock.java:61) ~[ma.class:?]
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.func_148833_a(CPacketPlayerTryUseItemOnBlock.java:13) ~[ma.class:?]
at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:16) ~[hv.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_291]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_291]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:846) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:467) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:630) [MinecraftServer.class:?]

MC 1.12 You will need to use an older version of Multiverse - 2.5.0 should work https://dev.bukkit.org/projects/multiverse-core/files/2428161