Waterfall error

[lucasdidur]

When i try to reconnect i got this error on console:

[11:57:12 WARN] [io.netty.util.concurrent.DefaultPromise]: An exception was thrown by eu.the5zig.reconnect.ReconnectTask$1.operationComplete()
java.lang.NoSuchMethodError: net.md_5.bungee.protocol.packet.KeepAlive.(I)V
at eu.the5zig.reconnect.ReconnectTask$1.operationComplete(ReconnectTask.java:123) ~[?:?]
at eu.the5zig.reconnect.ReconnectTask$1.operationComplete(ReconnectTask.java:102) ~[?:?]
at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:504) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:483) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:121) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:327) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:343) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:635) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:582) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:499) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:461) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) [Waterfall.jar:git:Waterfall-Bootstrap:1.12-SNAPSHOT:4adb1b4:181]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_172]