[protobuf] why am i getting this exception?

[Marco@worldcorp]

HI all
 i have wrote a simple messages.proto, compiled it (On Ubuntu Lucid
Lynx) with protobuf 2.2.0.
here's the .proto file

package tutorial;

option java_package = "com.example.messages";
option java_outer_classname = "MessageProtos";


enum MessageType {
    TEST = 0;
    DEBUG = 1;
    DO_TASK = 2;
  }

message Message {
  required string content = 1;
  optional MessageType type = 2;
}



I am using Netty as well, and when i run it i get the following
exception

2011-01-29 11:05:30,708 [client.NettyEchoHandler                 ]
ERROR * Unexpected exception from downstream. [New I/O client worker
#1-1]
com.google.protobuf.InvalidProtocolBufferException: Protocol message
tag had invalid wire type.
        at
com.google.protobuf.InvalidProtocolBufferException.invalidWireType(InvalidProtocolBufferException.java:
78)
        at com.google.protobuf.UnknownFieldSet
$Builder.mergeFieldFrom(UnknownFieldSet.java:496)
        at com.google.protobuf.GeneratedMessage
$Builder.parseUnknownField(GeneratedMessage.java:271)
        at com.example.messages.MessageProtos$Message
$Builder.mergeFrom(MessageProtos.java:318)
        at com.example.messages.MessageProtos$Message
$Builder.mergeFrom(MessageProtos.java:215)


could anyone help pls?

w/kindest regards
 marco


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