slam_gmapping on logged data

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Hi everybody, I need ur help again. I logged two bags, then was trying to build map using slam_gmapping. But, it's not working. when i run

$ rosrun gmapping slam_gmapping scan:=scan I used $roscore $rosrun rosaria RosAria and then $rosrun sicktoolbox_wrapper sicklms _port:=/dev/ttyUSB1 _baud:=38400 _resolution:=1.0 $rosbag record -a (for one bag) $ rosbag record -o gmapping_data.bag /scan /tf (for another bag) I checked rostopic list and saw then /scan /tf being published.

thanks in advance