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Is there any output? (Do you have output="screen" in your launch file?)

It would help if you could post the full code for the node. Are you catching the exceptions mentioned in the API? http://docs.ros.org/hydro/api/tf/html/c++/classtf_1_1Transformer.html#ac01a9f8709a828c427f1a5faa0ced42b

Is there any output? (Do you have output="screen" in your launch file?)

It would help if you could post the full code for the node. Are you catching the exceptions mentioned in the API? http://docs.ros.org/hydro/api/tf/html/c++/classtf_1_1Transformer.html#ac01a9f8709a828c427f1a5faa0ced42b

Edit:

It looks like your are trying to look up a transform before the listener has received enough information. Try adding a call to waitForTransform before lookupTransform. If that doesn't help, please add more of your code to your question.