RPC can't send string?

Hey guys,

I'm trying to send a string through an RPC, but I'm getting two errors that I haven't been able to fix yet. The errors and code are bellow respectively.

 (23,29): error CS1502: The best overloaded method match for `UnityEngine.NetworkView.RPC(string, UnityEngine.RPCMode, params object[])' has some invalid arguments

 (23,29): error CS1503: Argument `#1' cannot convert `method group' expression to type `string'

 using System;
 using UnityEngine;
 using System.Collections;
 public class ChatManager : MonoBehaviour
 {
  
 string userName;
 public SpriteText allText;
 public SpriteText userMessage;
  
  void Start ()
  {
  
  userName = GameObject.Find("Network").GetComponent<NetworkCode>().userAlias;
  }
  
  void Post ()
  {
  
  GetAndPostText ();
  string message = allText.Text + "\n" + userName + ": "  + userMessage.Text;
  networkView.RPC (MessageToPost, RPCMode.Others, message);
  }
  
  void GetAndPostText ()
  {
  
  allText.Text = allText.Text + "\n" + userName + ": "  + userMessage.Text;
  userMessage.text = "enter message here";
  userMessage.Text = "enter message here";
  }
  
  [RPC]
  void MessageToPost (string message)
  {
  
      allText.Text = message;
  }
 }

Thanks for all your help! Gibson