Hello,

I'm not familiar with programming, but I know this and that, I'm not a professional programmer. I do not even understand what this text means. I hope for help, I can not answer right away, if there are questions. Because of my work. I will answer when I have time after work.

"This text has been translated into English with Google.com Translator".

Minecraft Version 1.12.2
ModPack: TownCraft Version 3.3
https://www.curseforge.com/minecraft/modpacks/towncraft

Error message on my Minecraft Server:

[02:12:23] [Server thread/FATAL] [minecraft/MinecraftServer]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NoSuchMethodError: net.minecraft.entity.player.PlayerCapabilities.func_75092_a(F)V
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_191]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_191]
at net.minecraft.util.Util.runTask(SourceFile:531) [h.class:?]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:723) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:397) [nz.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]
Caused by: java.lang.NoSuchMethodError: net.minecraft.entity.player.PlayerCapabilities.func_75092_a(F)V
at Zevac.SurvivalFlight.Network.PacketFlightSpeed$Handler.handleServer(PacketFlightSpeed.java:57) ~[PacketFlightSpeed$Handler.class:?]
at Zevac.SurvivalFlight.Network.PacketFlightSpeed$Handler.access$000(PacketFlightSpeed.java:35) ~[PacketFlightSpeed$Handler.class:?]
at Zevac.SurvivalFlight.Network.PacketFlightSpeed$Handler$1.run(PacketFlightSpeed.java:41) ~[PacketFlightSpeed$Handler$1.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_191]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_191]
at net.minecraft.util.Util.runTask(SourceFile:529) ~[h.class:?]
... 5 more

See You.