[error] No Disparity images and synchronized triplets received in 'image_view'

[Mdmorshadurrahman]

Receiving images from both the cameras but not getting disparity images as well as synchronized triplets.

rosrun image_view stereo_view stereo:=/stereo image:=image_rect _approximate_sync:=True _queue_size:=2000
[ INFO] [1648727963.521988615]: Subscribing to:
* /stereo/left/image_rect
* /stereo/right/image_rect
* /stereo/disparity
[ WARN] [1648727978.592653685]: [stereo_view] Low number of synchronized left/right/disparity triplets received.
Left images received: 217 (topic '/stereo/left/image_rect')
Right images received: 218 (topic '/stereo/right/image_rect')
Disparity images received: 0 (topic '/stereo/disparity')
Synchronized triplets: 0
Possible issues:
* stereo_image_proc is not running.
Does rosnode info /stereo_view_1648727963390661294 show any connections?
* The cameras are not synchronized.
Try restarting stereo_view with parameter _approximate_sync:=True
* The network is too slow. One or more images are dropped from each triplet.
Try restarting stereo_view, increasing parameter 'queue_size' (currently 2000)
[ WARN] [1648727993.592497204]: [stereo_view] Low number of synchronized left/right/disparity triplets received.

checked with rqt_graph which seem ok

even, checked with rosnode info /stereo_view_1648727963390661294 this command and it shows:
Publications:

• /rosout [rosgraph_msgs/Log]

Subscriptions:

• /stereo/disparity [stereo_msgs/DisparityImage]
• /stereo/left/image_mono [sensor_msgs/Image]
• /stereo/right/image_mono [sensor_msgs/Image]

Services:

• /stereo_view_1648723258293586411/get_loggers
• /stereo_view_1648723258293586411/set_logger_level

contacting node http://192.168.7.166:36901/ ...
Pid: 6345
Connections:

• topic: /rosout
  • to: /rosout
  • direction: outbound (53323 - 192.168.7.201:33676) [14]
  • transport: TCPROS
• topic: /stereo/left/image_mono
  • to: /stereo/stereo_image_proc (http://192.168.7.166:38357/)
  • direction: inbound (37282 - 192.168.7.166:58649) [23]
  • transport: TCPROS
• topic: /stereo/right/image_mono
  • to: /stereo/stereo_image_proc (http://192.168.7.166:38357/)
  • direction: inbound (37278 - 192.168.7.166:58649) [21]
  • transport: TCPROS
• topic: /stereo/disparity
  • to: /stereo/stereo_image_proc (http://192.168.7.166:38357/)
  • direction: inbound (37280 - 192.168.7.166:58649) [22]
  • transport: TCPROS

my stereo_image_proc.launch file :

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