Simple movement goal problem

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Hi, when I try to run the following code to move the turtlebot 1 meter forward it becomes unresponsive (possibly when it is waiting for the server), and prints "None" if I do a keyboard interrupt:

#!/usr/bin/env python

import roslib; roslib.load_manifest('robot_red')
import rospy
import actionlib

#move_base_msgs
from move_base_msgs.msg import *

def simple_move():

    rospy.init_node('simple_move')

    #Simple Action Client
    sac = actionlib.SimpleActionClient('move_base', MoveBaseAction )

    #create goal
    goal = MoveBaseGoal()

    #use self?
    #set goal
    goal.target_pose.pose.position.x = 1.0
    goal.target_pose.pose.orientation.w = 1.0
    goal.target_pose.header.frame_id = 'first_move'
    goal.target_pose.header.stamp = rospy.Time.now()

    #start listner
    sac.wait_for_server()

    #send goal
    sac.send_goal(goal)

    #finish
    sac.wait_for_result()

    #print result
    print sac.get_result()


if __name__ == '__main__':
    try:
        simple_move()
    except rospy.ROSInterruptException:
        print "Keyboard Interrupt"

I think I may have to start a server seperately for the SimpleActionClient but am not sure what it would be. If anyone can describe what the problem might be I'll be eternally grateful. Thanks!