Able to run tests successfully on sauce labs using plugin in jenkins but when adding post build step Sauce Labs Test Publisher job start failing , it worked before 2 weeks also but now getting error and job is getting fail.

 
Stopped/completed/updated 0 jobs
Finished post-build for Sauce Labs plugin
Starting Sauce Labs test publisher
Finished Sauce Labs test publisher
ERROR: Build step failed with exception
java.lang.NullPointerException
at hudson.plugins.sauce_ondemand.SauceOnDemandReportPublisher.processBuildOutput(SauceOnDemandReportPublisher.java:349)
at hudson.plugins.sauce_ondemand.SauceOnDemandReportPublisher.getTestData(SauceOnDemandReportPublisher.java:162)
at hudson.plugins.sauce_ondemand.SauceOnDemandTestPublisher.addTestDataPublishersToBuildReport(SauceOnDemandTestPublisher.java:192)
at hudson.plugins.sauce_ondemand.SauceOnDemandTestPublisher.perform(SauceOnDemandTestPublisher.java:98)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.post2(Build.java:186)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
at hudson.model.Run.execute(Run.java:1752)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)
Build step 'Run Sauce Labs Test Publisher' marked build as failure