When I ran this project, it indicated that the processes of player3 and player4 had died

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[player3-19] process has died [pid 983769, exit code 1, cmd /opt/ros/noetic/lib/rosbag/play -r 1 -p a -q -d 2 /home/ll/2022_07_22_19_48_01_rect.bag /Alpha/velodyne_points:=/a/velodyne_points /Bob/velodyne_points:=/b/velodyne_points /Carol/velodyne_points:=/c/velodyne_points /Alpha/imu/data:=/a/imu/data /Bob/imu/data:=/b/imu/data /Carol/imu/data:=/c/imu/data __name:=player3 __log:=/home/ll/.ros/log/cac0bd6c-7e9a-11ee-834a-c99ff62cee8b/player3-19.log].
log file: /home/ll/.ros/log/cac0bd6c-7e9a-11ee-834a-c99ff62cee8b/player3-19*.log
[player4-20] process has died [pid 983778, exit code 1, cmd /opt/ros/noetic/lib/rosbag/play -r 1 -p b -q -d 2 /home/ll/2022_07_22_19_54_37_rect.bag /Alpha/velodyne_points:=/a/velodyne_points /Bob/velodyne_points:=/b/velodyne_points /Carol/velodyne_points:=/c/velodyne_points /Alpha/imu/data:=/a/imu/data /Bob/imu/data:=/b/imu/data /Carol/imu/data:=/c/imu/data __name:=player4 __log:=/home/ll/.ros/log/cac0bd6c-7e9a-11ee-834a-c99ff62cee8b/player4-20.log].
log file: /home/ll/.ros/log/cac0bd6c-7e9a-11ee-834a-c99ff62cee8b/player4-20*.log

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ok i understand, i need to change my bag in the launch file