Publish test result to Zephyr for Jira plugin error

[Esref Ozgur Altuntas]

When I try to select 'Publish test result to Zephyr for Jira' plugin inside of Post-build Actions section in Jenkins, there is an error occured. You can find below error messages. I could not do anything about that.

A problem occurred while processing the request. Please check our bug tracker to see if a similar problem has already been reported. If it is already reported, please vote and put a comment on it to let us gauge the impact of the problem. If you think this is a new issue, please file a new issue. When you file an issue, make sure to add the entire stack trace, along with the version of Jenkins and relevant plugins. The users list might be also useful in understanding what has happened.

Stack trace

java.lang.NullPointerException
	at com.thed.zephyr.jenkins.reporter.ZfjDescriptor.fetchServerList(ZfjDescriptor.java:455)
	at com.thed.zephyr.jenkins.reporter.ZfjDescriptor.doFillServerAddressItems(ZfjDescriptor.java:318)
	at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
	at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
Caused: javax.servlet.ServletException
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:765)