link pages in agile throws Unable to complete GreenHopper REST method error

While trying to link page from the board in Jira thrown excepltion as below and in the UI side throws internal server error.
2015-02-20 14:03:12,212 http-bio-8080-exec-5773 ERROR jirasupport 843x3460132x7 mvqxbp 10.125.72.113,87.254.208.61 /rest/greenhopper/1.0/integration/confluence/pages/search [greenhopper.web.integration.SearchConfluencePagesResource] Unable to complete GreenHopper REST method
java.lang.NullPointerException
at com.atlassian.greenhopper.web.integration.SearchPagesHelper$SearchPagesResponseHandler.check(SearchPagesHelper.java:196)
at com.atlassian.greenhopper.web.integration.SearchPagesHelper$SearchPagesResponseHandler.handle(SearchPagesHelper.java:138)
at com.atlassian.greenhopper.web.integration.SearchPagesHelper$SearchPagesResponseHandler.handle(SearchPagesHelper.java:133)
at com.atlassian.applinks.core.auth.trusted.TrustedApplinksReturningResponseHandler.handleNormally(TrustedApplinksReturningResponseHandler.java:40)
at com.atlassian.applinks.core.auth.trusted.TrustedApplinksReturningResponseHandler.handle(TrustedApplinksReturningResponseHandler.java:28)
at com.atlassian.plugins.rest.module.jersey.JerseyRequest$2.handle(JerseyRequest.java:166)
at com.atlassian.sal.core.net.HttpClientRequest.executeAndReturn(HttpClientRequest.java:351)
at com.atlassian.plugins.rest.module.jersey.JerseyRequest.executeAndReturn(JerseyRequest.java:161)
at com.atlassian.applinks.core.auth.ApplicationLinkRequestAdaptor.executeAndReturn(ApplicationLinkRequestAdaptor.java:78)
at com.atlassian.applinks.core.auth.trusted.TrustedRequest.executeAndReturn(TrustedRequest.java:51)
at com.atlassian.greenhopper.web.integration.SearchPagesHelper.searchPages(SearchPagesHelper.java:79)
at com.atlassian.greenhopper.web.integration.SearchConfluencePagesResource$1.call(SearchConfluencePagesResource.java:40)
at com.atlassian.greenhopper.web.integration.SearchConfluencePagesResource$1.call(SearchConfluencePagesResource.java:36)
at com.atlassian.greenhopper.web.util.RestCall.response(RestCall.java:42)
at com.atlassian.greenhopper.web.AbstractResource.createResponse(AbstractResource.java:100)
at com.atlassian.greenhopper.web.AbstractResource.response(AbstractResource.java:81)
at com.atlassian.greenhopper.web.integration.SearchConfluencePagesResource.searchPages(SearchConfluencePagesResource.java:35) <+3> (NativeMethodAccessorImpl.java:62) (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483) <+18> (DispatchProviderHelper.java:234) (DispatchProviderHelper.java:100) (DefaultMethodInvocation.java:61) (ExpandInterceptor.java:38) (DefaultMethodInvocation.java:61) (DispatchProviderHelper.java:132) (DispatchProviderHelper.java:230) (ResourceJavaMethodDispatcher.java:75) (HttpMethodRule.java:288) (ResourceClassRule.java:108) (RightHandPathRule.java:147) (RootResourceClassesRule.java:84) (WebApplicationImpl.java:1469) (WebApplicationImpl.java:1400) (WebApplicationImpl.java:1349) (WebApplicationImpl.java:1339) (WebComponent.java:416) (ServletContainer.java:537)
at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.doFilter(RestDelegatingServletFilter.java:178) <+1> (ServletContainer.java:795)
at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.doFilter(RestDelegatingServletFilter.java:73) <+16> (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70) (RestServletUtilsUpdaterFilter.java:26) (RestServletUtilsUpdaterFilter.java:40) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70) (ContextFilter.java:25) (DelegatingPluginFilter.java:78) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:70)