[ROS2 FOXY] : Could not transform base_link to map because "map" passed to lookupTransform argument target_frame does not exist.

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Hello , i am trying to do the transform between 2 frames (base_link and map) using the tf2_ros package, but it seems there is an issue somewhere. Both of the frames (base_link and map) do exist , i can see it on the tree frames when i use tf2_tools view_frames.py , also i am able to do the transform when using tf2_ros tf2_echo between my 2 frames and even more relevant , i am able to see on rviz all of the tfs being placed right, but when i am using in my code the lookup_transfrom method to get the transform between base_link and map, it says "Could not transform XPal_2/base_link to map because "map" passed to lookupTransform argument target_frame does not exist". here is the relevant code (knowing all of this code is inside a ros node called "SlamLocalization") :

self.source_frame = config_server.ROBOT_NETWORK["namespace"] + "/" + "base_link"   #namespace is XPal_2
self.target_frame = "map"

self.slam_tf_buffer = Buffer()
self.slam_tf_subscriber = TransformListener(self.slam_tf_buffer, self)
self.timer = self.create_timer(0.05, self.slam_tf_callback)

def slam_tf_callback(self):
       """
       Callback function for slam tf subscriber between map and robot frames
       """
       try:
           slam_tf = self.slam_tf_buffer.lookup_transform(self.target_frame, self.source_frame, rclpy.time.Time(),rclpy.duration.Duration(seconds=4.0) )
           logger.log("tf_transform : {}".format(slam_tf))
       except TransformException as ex:
           logger.log('Could not transform {} to {} because {}'.format(self.source_frame, self.target_frame, ex))
           return

       self.publish_slam_position(slam_tf) #method used to publish on a topic the position , not relevant for this issue

def main(args=None):
   rclpy.init(args=args)

   slam_localization = SlamLocalization()

   executor = MultiThreadedExecutor()

   rclpy.spin(slam_localization, executor=executor)

   # Destroy the node explicitly
   slam_localization.destroy_node()
   rclpy.shutdown()

 if __name__ == '__main__':
      main()

Also important to know , the frames map and odom (which is the child of map) are published by the package slam_toolbox and the rest of the frames are published by the urdf file (base_link and all of his childs)