ERROR: cannot launch node of type [ptam/cameracalibrator]: can't locate node [cameracalibrator] in package [ptam]

<launch>
    <node name="cameracalibrator" pkg="ptam" type="cameracalibrator" clear_params="true" output="screen">
        <remap from="image_raw" to usb_cam/image_raw" />
        <remap from="pose" to="pose"/>
        <rosparam file="$(find ptam)/PtamFixParams.yaml"/>
    </node>
</launch>

/rosout
/rosout_agg
/svo/dense_input
/svo/image
/svo/image/compressed
/svo/image/compressed/parameter_descriptions
...
/tf
/usb_cam/camera_info
/usb_cam/image_raw
/usb_cam/image_raw/compressed
...
/usb_cam/image_raw/theora
/usb_cam/image_raw/parameter_descriptions
/usb_cam/image_raw/parameter_updates

NODES
  /
    cameracalibrator (ptam/cameracalibrator)

./include
./include/ptam
./cfg
...
./launch
./src
./src/ptam
./src/ptam/cfg
...