No point cloud message

I use MulRan KAIST02 dastset, when i run file_player.launch, only imu topic ang ground truth topic are published, but os1_points topic sill has no new messages.
my dataset file is that
   MulRan_02
        sensor_data global_pose.csv
        Ouster radar data_stamp.csv gps.csv navtech_top_stamp.csv ouster_front_stamp.csv xsens_imu.csv

can you help me