Problem with error in Arduino 0012

Forum 2005-2010 (read only) Hardware Troubleshooting
1

Hello, my name is Stavros.
I' m getting started with arduino Duemilanove for a project with Max/msp.I got the script to upload on the board.It is a simple message script with arduino 0012.Unfortunately, i get an error while compiling.I have posted below the .pde file and the error message,if you can help me solve it.

#include <SimpleMessageSystem.h>

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  if (messageBuild() > 0)
  {
    switch (messageGetChar ())
    {
      case 'r' :
      readpins ();
      break;
      case 'w' :
      writepin ();
    }
  }
}

void readpins ()
{
  switch (messageGetChar())
  {
    case 'd' :
    messageSendChar('d');
    for (char i=2;i<14;i++)
    {
      messageSendInt (digitalRead (i));
    }
    messageEnd();
    break;
     case 'a' :
    messageSendChar('a');
    for (char i=0;i<6;i++)
    {
      messageSendInt (analogRead (i));
    }
    messageEnd();
  }
}


void writepin()
{
  int pin;
  int state;
  switch (messageGetChar())
  {
    case 'a' :
    pin = messageGetInt();
    state = messageGetInt();
    pinMode(pin, OUTPUT);
    analogWrite(pin, state);
    break;
    
    case 'd' :
    pin = messageGetInt();
    state = messageGetInt();
    pinMode (pin, OUTPUT);
    digitalWrite(pin, state);
    
  }
}

Error :
In function 'void loop()':
error: 'messageBuild' was not declared in this scope In function 'void readpins()':
In function 'void writepin()':

Thank you in advance.