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the error :

chong@ubuntu:~$ roslaunch rgbdslam rgbdslam.launch
... logging to /home/chong/.ros/log/ecef703a-adb5-11e1-aba4-74e50b030cfa/roslaunch-ubuntu-2680.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://ubuntu:36167/

SUMMARY
========

PARAMETERS
 * /rgbdslam/config/predecessor_candidates
 * /rgbdslam/config/wide_cloud_topic
 * /rosdistro
 * /rgbdslam/config/use_gui
 * /rgbdslam/config/visualization_skip_step
 * /rgbdslam/config/individual_cloud_out_topic
 * /rgbdslam/config/max_keypoints
 * /rgbdslam/config/sufficient_matches
 * /rgbdslam/config/max_connections
 * /rgbdslam/config/min_keypoints
 * /rgbdslam/config/optimizer_skip_step
 * /rosversion
 * /rgbdslam/config/store_pointclouds
 * /rgbdslam/config/matcher_type
 * /rgbdslam/config/min_sampled_candidates
 * /rgbdslam/config/topic_image_mono
 * /rgbdslam/config/feature_detector_type
 * /rgbdslam/config/feature_extractor_type
 * /rgbdslam/config/wide_topic
 * /rgbdslam/config/neighbor_candidates
 * /rgbdslam/config/drop_async_frames

NODES
  /
    rgbdslam (rgbdslam/rgbdslam)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[rgbdslam-1]: started with pid [2698]
bool g2o::HyperGraphActionLibrary::registerAction(g2o::HyperGraphElementAction*): creating collection for "writeGnuplot"
bool g2o::HyperGraphActionLibrary::registerAction(g2o::HyperGraphElementAction*): creating collection for "draw"
[ERROR] [1338753284.746435498]: Cannot use concurrent node construction with SiftGPU matcher! 'concurrent_node_construction' was set to false
[ERROR] [1338753284.746594629]: Cannot use concurrent edge construction with SiftGPU matcher! 'concurrent_edge_construction' was set to false