help please!!! How to use "LiDAR_IMU_Init" to init my own data?

[WN-Wolf]

I am a beginner, if you by pass, please take a look, many thanks! I want to use FAST_LIO, but first I have to calibrate time. lidar：livox mid-70 IMU：wit JY901B

I followed the readme to operate step by step, But there didn't have any results or error. Here is my operation process. Please help to check which step went wrong! Thanks a lot!

1. start lidar roslaunch livox_ros_driver livox_lidar.launch
2. start imu roslaunch wit_ros_imu wit_imu.launch
3. to verify if data can be recieved rostopic echo /livox/lidar rostopic echo /wit/imu
4. record a rosbag rosbag record -o my_livox_wit.bag /livox/lidar /wit/imu
5. modify livox_wit_test.launch
6. modify wit_test.yaml
7. start lidar_imu_init roslaunch lidar_imu_init livox_wit_test.launch
8. another terminal rosbag play

The points: rviz didn't show anything terminal didn't show any error

The questions: Initialization_result.txt didn't have anything! I don't know how to do, please help me, many thanks!!! @zfc-zfc @Taeyoung96 @UAVlover