500 Internal Server Error:cib/live/agents/ocf%253Aheartbeat%253Aapache

Hawk Version : 2.6.15
OS：ubuntu

**Appearance:**
when "Create Primitive " in Web GUI ，obtain error message in web page : ****Failed to fetch meta attributes****

** Trace to :**
Request : GET | https://192.168.197.129:7630/cib/live/agents/ocf%253Aheartbeat%253Aapache?format=json
Response: 500 Internal Server Error

**OS Messages about hawk service :**

3月 30 19:37:27 ubuntu puma[777]: 2021-03-30 19:37:27 +0800: Rack app error handling request { GET /cib/live/agents/ocf%253Aheartbeat%253Aapache }
3月 30 19:37:27 ubuntu puma[777]: #
3月 30 19:37:27 ubuntu puma[777]: /usr/share/hawk/app/controllers/application_controller.rb:206:in `not_found'
3月 30 19:37:27 ubuntu puma[777]: /usr/share/hawk/app/controllers/agents_controller.rb:38:in `block (2 levels) in show'
3月 30 19:37:27 ubuntu puma[777]: /var/lib/gems/2.3.0/gems/actionpack-5.2.4.5/lib/action_controller/metal/mime_responds.rb:203:in `respond_to'
3月 30 19:37:27 ubuntu puma[777]: /usr/share/hawk/app/controllers/agents_controller.rb:37:in `show'
3月 30 19:37:27 ubuntu puma[777]: /var/lib/gems/2.3.0/gems/actionpack-5.2.4.5/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
3月 30 19:37:27 ubuntu puma[777]: /var/lib/gems/2.3.0/gems/actionpack-5.2.4.5/lib/abstract_controller/base.rb:194:in `process_action'
3月 30 19:37:27 ubuntu puma[777]: /var/lib/gems/2.3.0/gems/actionpack-5.2.4.5/lib/action_controller/metal/rendering.rb:30:in `process_action'

Why? thanks