Unable to create Jira issue if linked to epic

2016-03-23 16:52:23,554 http-nio-8080-exec-11 ERROR admin 1012x853x1 jeozli 127.0.0.1 /rest/api/2/issue/bulk [c.a.j.rest.exception.ExceptionInterceptor] Returning internal server error in response
java.lang.reflect.InvocationTargetException
	at sun.reflect.GeneratedMethodAccessor958.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$ResponseOutInvoker$1.invoke(DispatchProviderHelper.java:192)
	at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$1.intercept(DispatchProviderHelper.java:83)
	... 3 filtered
	at com.atlassian.jira.rest.exception.ExceptionInterceptor.intercept(ExceptionInterceptor.java:55)
	... 1 filtered
	at com.atlassian.jira.rest.v2.issue.scope.RequestScopeInterceptor.intercept(RequestScopeInterceptor.java:39)
	... 15 filtered
	at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.doFilter(RestDelegatingServletFilter.java:154)
	... 1 filtered
	at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.doFilter(RestDelegatingServletFilter.java:68)
	... 86 filtered
	at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:70)
	... 15 filtered
	at com.atlassian.plugins.rest.module.servlet.RestSeraphFilter.doFilter(RestSeraphFilter.java:37)
	... 74 filtered
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at com.atlassian.greenhopper.service.issuelink.EpicServiceImpl.addIssuesToEpic(EpicServiceImpl.java:90)
	at com.atlassian.greenhopper.customfield.epiclink.EpicLinkRestFieldOperationsHandler.update(EpicLinkRestFieldOperationsHandler.java:104)
	at com.atlassian.greenhopper.customfield.epiclink.EpicLinkRestFieldOperationsHandler.handleOperation(EpicLinkRestFieldOperationsHandler.java:76)
	at com.atlassian.greenhopper.customfield.epiclink.EpicLinkRestFieldOperationsHandler.updateIssueInputParameters(EpicLinkRestFieldOperationsHandler.java:64)
	at com.atlassian.jira.rest.v2.issue.IssueInputParametersAssembler$IssueInputParametersBuilder.finalizeIssueInputParams(IssueInputParametersAssembler.java:428)
	at com.atlassian.jira.rest.v2.issue.IssueInputParametersAssembler.makeCreateAssembler(IssueInputParametersAssembler.java:131)
	at com.atlassian.jira.rest.v2.issue.IssueInputParametersAssembler.makeCreateAssemblers(IssueInputParametersAssembler.java:138)
	at com.atlassian.jira.rest.v2.issue.CreateIssueResource.createIssues(CreateIssueResource.java:77)
	at com.atlassian.jira.rest.v2.issue.IssueResource.createIssues(IssueResource.java:624)
	... 210 more

--------------------------
Parameters
--------------------------
avatarId : 10324
size : xsmall
iconType : project
serverId : ede78247-11c9-32ac-95b2-ac5ff936f756
caused by: java.lang.IllegalArgumentException: The template variable, projectId, has no value
at com.sun.jersey.api.uri.UriTemplate.templateVariableHasNoValue(UriTemplate.java:892)

2016-03-23 16:52:18,771 ERROR [http-nio-8090-exec-5] [ContainerBase.[Standalone].[localhost].[/confluence]] log Unhandled exception occurred whilst decorating page
 -- referer: http://localhost:8090/confluence/display/NEW/asd22 | url: /confluence/plugins/servlet/jira-integration/icons | userName: admin
java.lang.IllegalArgumentException: The template variable, projectId, has no value
	at com.sun.jersey.api.uri.UriTemplate.templateVariableHasNoValue(UriTemplate.java:892)
	at com.sun.jersey.api.uri.UriTemplate.createURIComponent(UriTemplate.java:661)