add a new frame to the tree

edit

Hi,

I use the following commands to build add a frame to a tree. The rviz shows there is a frame, but when I try obj_frame_pose_stamped = change_pose_stamped_frame(self.tf_listener, pose_stamped, "base_link"), the error is:tf.Exception: Frame id /grasp_frame does not exist!

Do you have any ideas?

        br = tf.TransformBroadcaster()
        br.sendTransform((1,0,0),
                         (0, 0, 0, 1),
                         self.object_stamp[0],
                         "grasp_frame",
                         "openni_rgb_optical_frame")