Cucumber-slack-notifier Plug in - Received HTTP Status code [400] while posting to slack

gistfile1.txt

java.lang.RuntimeException: Received HTTP Status code [400] while posting to slack
	at org.jenkinsci.plugins.slacknotifier.SlackClient.postToSlack(SlackClient.java:62)
	at org.jenkinsci.plugins.slacknotifier.SlackClient.postToSlack(SlackClient.java:54)
	at org.jenkinsci.plugins.slacknotifier.SlackClient.postToSlack(SlackClient.java:41)
	at org.jenkinsci.plugins.slacknotifier.CucumberSlackService.sendCucumberReportToSlack(CucumberSlackService.java:33)
	at org.jenkinsci.plugins.slacknotifier.CucumberSlackPostBuildNotifier.perform(CucumberSlackPostBuildNotifier.java:67)
	at hudson.tasks.BuildStepMonitor$2.perform(BuildStepMonitor.java:32)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
	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:1878)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:428)
Build step 'Send Cucumber Report to Slack' marked build as failure

gistfile2.txt

Received HTTP Status code [400] while posting to slack

I am facing the same issue. Any solution?