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I added

<node pkg="tf" type="static_transform_publisher" name="base_to_laser_broadcaster"
      args="0 0 0 0 0 0 base_link laser 50"/>

into my launch file. But I always get the error "lookupTransform base_frame to laser timed out.... Frame /laser exists with parent /base_link. Frame /base_link exists with parent NO_PARENT." Is there something else missing? Really appreciate your help.

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