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:
<launch> <node pkg="laser_filters" type="scan_to_scan_filter_chain" output="screen" name="laser_filter"> <remap from="scan" to="base_scan" /> <rosparam command="load" file="$(find laser_filters)/examples/angle_filter_example.yaml" /> </node> </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?