tf.LookupException: "base_link" passed to lookupTransform argument target_frame does not exist.

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Hello together,

I am new with ros tf's and already worked myself threw the tf tutorials. (I am using ros indigo) As my first test with tf's after the tutorial I wrote 2 small nodes.

The first one is sending a tf:

#!/usr/bin/env python

import rospy
import tf

class tf_firsttry_pub_class():
    def __init__(self):
        rospy.init_node('tf_firsttry_pub')
        now = rospy.Time.now()
        br = tf.TransformBroadcaster()
        while not rospy.is_shutdown():
            br.sendTransform((1, 1, 1), (0, 0, 0, 1), rospy.Time(), 'one','base_link')
            rospy.Rate(50)


if __name__ == '__main__':
    try:
        tf_firsttry_pub_class()
    except rospy.ROSInterruptException:
        pass

The second is listening to the tf:

#!/usr/bin/env python

import rospy
import tf

class tf_firsttry_listen_class():
    def __init__(self):
        rospy.init_node('tf_firsttry_listen')
        listener = tf.TransformListener()
        now = rospy.Time.now()
        while not rospy.is_shutdown():
            (trans,rot)=listener.lookupTransform('/base_link','/one',rospy.Time(0))
            print trans

if __name__ == '__main__':
    try:
        tf_firsttry_listen_class()
    except rospy.ROSInterruptException:
        pass

When starting the second node this error occurs:

line 11, in __init__ (trans,rot)=listener.lookupTransform('/base_link','/one',rospy.Time(0)) tf.LookupException: "base_link" passed to lookupTransform argument target_frame does not exist.

I already found in a different question that a try: except: shell around the listener could help as it may only fail at the beginning but that doesn't help.

As you see the code is easy but I am totally stuck. I think I misunderstood something but can't figure out what.

Any solutions?

Thanks in advance!