ira_laser_tools merger node is not subscribing lidar topics

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Hi, I am trying to merge 3 lidar feed. Lidar point cloud topics are working fine. When I tried to run ira_laser_tool node it is working but it is not subscribing to my lidar topis? I have add rostopic list, rosnode info. Also, asking for other tools like laser_merger?

rostopic list:

rostopic list
/laserscan_multi_merger/parameter_descriptions
/laserscan_multi_merger/parameter_updates
/merged_cloud
/rosout
/rosout_agg
/scan_multi
/sensor1/points
/sensor2/points
/sensor3/points
/tf
/tf_static

rosnode info:

rosnode info /laserscan_multi_merger 
--------------------------------------------------------------------------------
Node [/laserscan_multi_merger]
Publications: 
 * /laserscan_multi_merger/parameter_descriptions [dynamic_reconfigure/ConfigDescription]
 * /laserscan_multi_merger/parameter_updates [dynamic_reconfigure/Config]
 * /merged_cloud [sensor_msgs/PointCloud2]
 * /rosout [rosgraph_msgs/Log]
 * /scan_multi [sensor_msgs/LaserScan]

Subscriptions: 
 * /tf [unknown type]
 * /tf_static [unknown type]

Services: 
 * /laserscan_multi_merger/get_loggers
 * /laserscan_multi_merger/set_logger_level
 * /laserscan_multi_merger/set_parameters


contacting node http://******-***002:******/ ...
Pid: 9156
Connections:
 * topic: /rosout
    * to: /rosout
    * direction: outbound
    * transport: TCPROS

when Node is working:

roslaunch ira_laser_tools laserscan_multi_merger.launch 
... logging to /home/bchan/.ros/log/d6143206-e867-11ea-8f07-10653056d93e/roslaunch-*****-*****-*****.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://***PC-******:*****/

SUMMARY
========

PARAMETERS
 * /laserscan_multi_merger/angle_increment: 0.0058
 * /laserscan_multi_merger/angle_max: 2.0
 * /laserscan_multi_merger/angle_min: -2.0
 * /laserscan_multi_merger/cloud_destination_topic: /merged_cloud
 * /laserscan_multi_merger/destination_frame: Lidar_merge
 * /laserscan_multi_merger/laserscan_topics: /sensor_1/points ...
 * /laserscan_multi_merger/range_max: 50.0
 * /laserscan_multi_merger/range_min: 0.3
 * /laserscan_multi_merger/scan_destination_topic: /scan_multi
 * /laserscan_multi_merger/scan_time: 0.0333333
 * /rosdistro: kinetic
 * /rosversion: 1.12.14

NODES
  /
    laserscan_multi_merger (ira_laser_tools/laserscan_multi_merger)

Thanks for help in advance!!!! If there any other options available like ira_merger tool.