BungeeCord Error 1.5.2

Help me! Version 1.5.2 #548

Error:


13.08 22:20:29 [Server] INFO ... 13 more
13.08 22:20:29 [Server] INFO at io.netty.handler.codec.ReplayingDecoder.callDecode(ReplayingDecoder.java:356)
13.08 22:20:29 [Server] INFO at net.md_5.bungee.netty.PacketDecoder.decode(PacketDecoder.java:39)
13.08 22:20:29 [Server] INFO at net.md_5.bungee.protocol.Vanilla.read(Vanilla.java:78)
13.08 22:20:29 [Server] INFO Caused by: java.lang.RuntimeException: Unknown packet id 21
13.08 22:20:29 [Server] INFO at...

BungeeCord Error 1.5.2