It seems like 1.20 has finally broken the support of Yamler and Bungeecord RCON.
[14:23:39 WARN]: Exception encountered when loading plugin: BungeeRcon
java.lang.NoSuchMethodError: org.yaml.snakeyaml.representer.Representer: method 'void <init>()' not found
at net.cubespace.Yamler.Config.BaseConfigMapper.<init>(BaseConfigMapper.java:27) ~[?:?]
at net.cubespace.Yamler.Config.ConfigMapper.<init>(ConfigMapper.java:13) ~[?:?]
at net.cubespace.Yamler.Config.YamlConfig.<init>(YamlConfig.java:12) ~[?:?]
at net.cubespace.Yamler.Config.Config.<init>(Config.java:4) ~[?:?]
at net.borlcand.rcon.config.MainConfig.<init>(MainConfig.java:10) ~[?:?]
at net.borlcand.rcon.config.ConfigManager.<clinit>(ConfigManager.java:7) ~[?:?]
at net.borlcand.rcon.Rcon.startListener(Rcon.java:38) ~[?:?]
at net.borlcand.rcon.Rcon.onEnable(Rcon.java:34) ~[?:?]
at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(PluginManager.java:316) ~[waterfall-1.20-536.jar:git:Waterfall-Bootstrap:1.20-R0.1-SNAPSHOT:ec41547:536]
at net.md_5.bungee.BungeeCord.start(BungeeCord.java:299) ~[waterfall-1.20-536.jar:git:Waterfall-Bootstrap:1.20-R0.1-SNAPSHOT:ec41547:536]
at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:67) ~[waterfall-1.20-536.jar:git:Waterfall-Bootstrap:1.20-R0.1-SNAPSHOT:ec41547:536]
at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15) ~[waterfall-1.20-536.jar:git:Waterfall-Bootstrap:1.20-R0.1-SNAPSHOT:ec41547:536]
It seems like 1.20 has finally broken the support of Yamler and Bungeecord RCON.