[ERROR] : Called wait_for_result when no goal exists

edit

This is terminal output:

[ERROR] [1660043302.501132, 4595.399000]: Called wait_for_result when no goal exists

[INFO] [1660043302.505849, 4595.405000]: Goal execution done!

It says Goal execution done but robot is not moving.

Can someone help me please?

from unittest import result
import rospy
import actionlib
from move_base_msgs.msg import MoveBaseAction, MoveBaseGoal

class SendGoal():
    def __init__(self):
        self.client = actionlib.SimpleActionClient('move_base',MoveBaseAction)
        self.wait = self.client.wait_for_result()

        self.goal = MoveBaseGoal()
        self.goal.target_pose.header.frame_id = "map"
        self.goal.target_pose.header.stamp = rospy.Time.now()
        self.goal.target_pose.pose.position.x = 30.0
        self.goal.target_pose.pose.orientation.w = 0.01
        self.goal.target_pose.pose.position.y = -10.5

    def movebase_client(self):

        self.client.wait_for_server()

        self.client.send_goal(self.goal)

        if result:
            print("job done")
        if not self.wait:
            rospy.logerr("Action server not available!")
            rospy.signal_shutdown("Action server not available!")
        else:
            return self.client.get_result()

if __name__ == '__main__':
    try:
        rospy.init_node('movebase_client_py')
        result = SendGoal().movebase_client()
        if result:
            rospy.loginfo("Goal execution done!")
    except rospy.ROSInterruptException:
        rospy.loginfo("Navigation test finished.")