Custom action goal: "has no attribute" error

edit

I have created a custom action called TakePosition.action with the following data :

#goal
int64 x
int64 y
int64 z
string position
---
#result
bool completed
---
#feeback
string report

When I try using my TakePositionActionGoal in my client.py script, I get an error saying :

  File "/home/sisko/catkin_ws/devel/lib/python2.7/dist-packages/sweepbot_tools/msg/_TakePositionActionGoal.py", line 122, in serialize
    buff.write(_get_struct_3q().pack(_x.goal.x,
_x.goal.y, _x.goal.z)) AttributeError: 'TakePositionActionGoal' object has no attribute 'x'

Here's my client.py script :

#! /usr/bin/env python
from __future__ import print_function

import rospy
from sweepbot_tools.msg import TakePositionAction, TakePositionActionGoal

import actionlib

def setPosition():
    client = actionlib.SimpleActionClient('sweepbot_movebase_server', TakePositionAction)

    client.wait_for_server()

    goal = TakePositionActionGoal()
    goal.goal.x = 7
    goal.goal.y = 7
    goal.goal.z = 7
    goal.goal.position = ''

    client.send_goal(goal)

    client.wait_for_result()

    return client.get_result()

if __name__ == '__main__':
    try:
        rospy.init_node('sweepbot_movebase_client')
        result = setPosition()
        rospy.logdebug(result)
    except rospy.ROSInterruptException:
        print("program interrupted before completion", file=sys.stderr)

The porpose is to create pose data which I can pass to my custom action server which would calls move_base with the recieved pose.

Clearly there is an x attribute in my action definition. I don't understand what the souce of this error is.