Hi,
We have installed the Jira on our dedicated server successfully. However, we are randomly receiving the error as "
Sorry, we had some technical problems during your last operation."

Can someone please help?
We have been trying to use this software over a month now but no luck so far. We will really appreciate if someone can help us to identify the issue and resolve the issue.
I have paste the technical details below.
Thank you
Zahid
Technical details
Log's referral number: 03846aa9-21cc-4692-ad98-475b646c69b0
Cause
Referer URL: Unknown
java.lang.RuntimeException: org.ofbiz.core.entity.GenericDataSourceException: SQL Exception while executing the following:SELECT COUNT(*) FROM permissionscheme (Communications link failure
The last packet successfully received from the server was 228,247 milliseconds ago. The last packet sent successfully to the server was 2 milliseconds ago.)
java.lang.RuntimeException: org.ofbiz.core.entity.GenericDataSourceException: SQL Exception while executing the following:SELECT COUNT(*) FROM permissionscheme (Communications link failure
The last packet successfully received from the server was 228,247 milliseconds ago. The last packet sent successfully to the server was 2 milliseconds ago.)
at com.atlassian.jira.startup.DatabaseInitialImporter.dataAlreadyLoaded(DatabaseInitialImporter.java:43) [classes/:?]
at com.atlassian.jira.web.action.setup.SetupDatabase.doDefault(SetupDatabase.java:139) [classes/:?]
at sun.reflect.GeneratedMethodAccessor231.invoke(Unknown Source) [?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [?:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) [?:1.8.0_181]
at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70) [webwork-1.4-atlassian-30.jar:?]
at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56) [webwork-1.4-atlassian-30.jar:?]
at webwork.action.ActionSupport.invokeCommand(ActionSupport.java:438) [webwork-1.4-atlassian-30.jar:?]
at webwork.action.ActionSupport.execute(ActionSupport.java:157) [webwork-1.4-atlassian-30.jar:?]
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:63) [jira-api-7.12.3.jar:?]
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:39) [webwork-1.4-atlassian-30.jar:?]
at webwork.interceptor.NestedInterceptorChain.proceed(NestedInterceptorChain.java:31) [webwork-1.4-atlassian-30.jar:?]
at webwork.interceptor.ChainedInterceptor.intercept(ChainedInterceptor.java:16) [webwork-1.4-atlassian-30.jar:?]
at webwork.interceptor.DefaultInterceptorChain.proceed(DefaultInterceptorChain.java:35) [webwork-1.4-atlassian-30.jar:?]
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:225) [webwork-1.4-atlassian-30.jar:?]
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:154) [webwork-1.4-atlassian-30.jar:?]
at com.atlassian.jira.web.dispatcher.JiraWebworkActionDispatcher.service(JiraWebworkActionDispatcher.java:138) [classes/:?]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [servlet-api.jar:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [catalina.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.32]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.5.32]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.32]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [?:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [?:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.greenhopper.jira.filters.ClassicBoardRouter.doFilter(ClassicBoardRouter.java:62) [?:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.mywork.client.filter.ServingRequestsFilter.doFilter(ServingRequestsFilter.java:37) [?:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:64) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:58) [atlassian-plugins-servlet-4.5.1.jar:?]
at com.atlassian.analytics.client.filter.UniversalAnalyticsFilter.doFilter(UniversalAnalyticsFilter.java:92) [?:?]
at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:39) [?:?]
...
...
...
Caused by: org.ofbiz.core.entity.GenericDataSourceException: SQL Exception while executing the following:SELECT COUNT(*) FROM permissionscheme (Communications link failure