MapWritable messages in Giraph

[Pasupathy Mahalingam]

Hi,

I'm trying to send messages that is MapWritable

      MapWritable msg = new MapWritable();
      msg.put(new Text("test"), new DoubleWritable(edgeWeightage));
      sendMessage(edge.getTargetVertexId(), msg);

However, I find that this is throwing exception (IllegalStateException)

Any inputs on what to take care while sending MapWritable messages?

Rgds
Pasupathy