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The problem is solved after referring to this link. The workaround is, I used a sleep function after tfObject creation.

tl_ = tf.TransformListener();
rospy.sleep(10.)
# The above sleep function gives the sufficient time to load frames from /tf

The problem is solved after referring to this link. The workaround is, I used a sleep function after tfObject creation.

tl_ = tf.TransformListener();
rospy.sleep(10.)
# The above sleep function gives the sufficient time to load frames from /tf topic