18:27:58 [WARNING] Exception encountered when loading plugin: LuckPerms
java.lang.NoSuchMethodError: net.md_5.bungee.config.Configuration.contains(Ljava/lang/String;)Z
at me.lucko.luckperms.bungee.BungeeConfig.contains(BungeeConfig.java:80)
at me.lucko.luckperms.common.config.ConfigKeys.lambda$static$0(ConfigKeys.java:116)
at me.lucko.luckperms.common.config.keys.AbstractKey.get(AbstractKey.java:41)
at me.lucko.luckperms.common.config.AbstractConfiguration.lambda$new$0(AbstractConfiguration.java:42)
at com.github.benmanes.caffeine.cache.UnboundedLocalCache$UnboundedLocalLoadingCache.lambda$new$0(UnboundedLocalCache.java:922)
at com.github.benmanes.caffeine.cache.UnboundedLocalCache.lambda$computeIfAbsent$2(UnboundedLocalCache.java:235)
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
at com.github.benmanes.caffeine.cache.UnboundedLocalCache.computeIfAbsent(UnboundedLocalCache.java:231)
at com.github.benmanes.caffeine.cache.LocalCache.computeIfAbsent(LocalCache.java:113)
at com.github.benmanes.caffeine.cache.LocalLoadingCache.get(LocalLoadingCache.java:67)
at java.lang.Iterable.forEach(Iterable.java:75)
at me.lucko.luckperms.common.config.AbstractConfiguration.loadAll(AbstractConfiguration.java:58)
at me.lucko.luckperms.bungee.LPBungeePlugin.onEnable(LPBungeePlugin.java:132)
at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(PluginManager.java:227)
at net.md_5.bungee.BungeeCord.start(BungeeCord.java:267)
at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:55)
at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15)

What version Forge?
Spigot, Bukkit or Sponge?
What version Bungeecord?
What version LuckPerms-Bungee

Make sure the versions match across the board.

Update to the latest version of BungeeCord.