Suddenly existing queues are not visible to admin and technician also. When I treid to create new queue, after hitting create button the queue is getting invisible. In "atlassian-jira.log" it is showing below error.
2020-01-22 11:01:31,626 http--8889-exec-11 ERROR admin 661x9859x1 pefo9c /rest/servicedesk/1/INC/webfragments/sections/sd-queues-nav,servicedesk.agent.queues,servicedesk.agent.queues.ungrouped [c.a.plugin.web.DefaultWebInterfaceManager] WebItemProvider from module 'com.atlassian.servicedesk.project-ui:sd-queues-custom-provider' threw an error 'java.lang.NullPointerException'. Web-items provided by this provider will be ignored.
In catalina.out also it is showing below errors
2020-01-21 19:27:47,056 http-8889-exec-24 ERROR 1167x60538x2 1qn353t /rest/servicedesk/1/INC/webfragments/sections/sd-queues-nav,servicedesk.agent.queues,servicedesk.agent.queues.ungrouped [c.a.plugin.web.DefaultWebInterfaceManager] WebItemProvider from module 'com.atlassian.servicedesk.project-ui:sd-queues-custom-provider' threw an error 'java.lang.NullPointerException'. Web-items provided by this provider will be ignored.
2020-01-21 19:28:13,819 http-8889-exec-21 ERROR 1168x60638x2 1qn353t /rest/servicedesk/1/INC/webfragments/sections/sd-queues-nav,servicedesk.agent.queues,servicedesk.agent.queues.ungrouped [c.a.plugin.web.DefaultWebInterfaceManager] WebItemProvider from module 'com.atlassian.servicedesk.project-ui:sd-queues-custom-provider' threw an error 'java.lang.NullPointerException'. Web-items provided by this provider will be ignored.
2020-01-21 19:28:20,882 http-8889-exec-22 ERROR 1168x60685x1 1qn353t /rest/servicedesk/1/INC/webfragments/sections/sd-queues-nav,servicedesk.agent.queues,servicedesk.agent.queues.ungrouped [c.a.plugin.web.DefaultWebInterfaceManager] WebItemProvider from module 'com.atlassian.servicedesk.project-ui:sd-queues-custom-provider' threw an error 'java.lang.NullPointerException'. Web-items provided by this provider will be ignored.
Please let me know how to resolve this issue and why suddenly it occured.