Not able to find TransformListener.frameExists('color_ball')

I was following the tutorial ROS Developers LIVE-Class #59: MoveIt! Robot Perception - YouTube , however there was an error which was not clear, did anyone solved this error ? It was regarding something like

if t.frameExists('link_base') and t.frameExists('color_ball'):
    # lookupTransform(target_frame, source_frame, time) -> (position, quaternion)
    (translation,rotation) = t.lookupTransform("marker","link_base",

Whats the error exactly? Can you post an image capture of the error and some code?

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