unable to start server

[redwolf344]

when i load the server, this pops up. any help?
[23:13:47] [Server thread/ERROR]: [ProtocolSupport] Error when loading, shutting down
java.lang.ClassCastException: java.util.concurrent.ConcurrentLinkedQueue cannot be cast to java.util.List
    at protocolsupport.zplatform.impl.spigot.injector.network.SpigotNettyInjector.inject(SpigotNettyInjector.java:24) ~[?:?]
    at protocolsupport.zplatform.impl.spigot.injector.SpigotPlatformInjector.onLoad(SpigotPlatformInjector.java:16) ~[?:?]
    at protocolsupport.ProtocolSupport.onLoad(ProtocolSupport.java:71) ~[?:?]
    at org.bukkit.craftbukkit.v1_15_R1.CraftServer.loadPlugins(CraftServer.java:363) ~[spigot.jar:git-Paper-137]
    at net.minecraft.server.v1_15_R1.DedicatedServer.init(DedicatedServer.java:234) ~[spigot.jar:git-Paper-137]
    at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:885) ~[spigot.jar:git-Paper-137]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]

[zKoro]

Remove ProtocolSupport and use ViaVersion instead if you want your server to support 1.8+. Make sure to use these plugins:

ViaVersion: Base Plugin
ViaBackwards: 1.9+ Support
ViaRewind: 1.8-1.8.8 Support