No output /base_scan or /scan_filtered in LaserScanAngularBoundsFilter

[gokcesena]

Hello, I am using the Noetic version and I have a rplidar a2m12 lidar. I want to use LaserScanAngularBoundsFilter, the launch and yaml file for this is as follows: launch: `

`

yaml: `scan_filter_chain:

• name: angle type: laser_filters/LaserScanAngularBoundsFilter params: lower_angle: 0.003228 upper_angle: 1.469089`

When I type "roslaunch laser_filters angle_filter_example.launch" into the terminal and call rostopic list, I get the following

output: `/base_scan /rosout /rosout_agg /scan /scan_filtered'
When I run rostopic echo /base_scan or rostopic echo /scan_filtered, no output appears in the terminal. Can you help me?