We are getting the below exception in Jenkins 2.7.1 while running the job. we've tried to install Pipeline SCM API in Blue Ocean to use the Pipeline feature. but after installing the plugin it got this error. we have uninstalled the plugin but it still happening there.We are getting the below exception in Jenkins 2.7.1 while running the job. we've tried to install Pipeline SCM API in Blue Ocean to use the Pipeline feature. but after installing the plugin it got this error. we have uninstalled the plugin but it still happening there.

FATAL: org/jenkinsci/plugins/workflow/job/WorkflowRunjava.lang.NoClassDefFoundError: org/jenkinsci/plugins/workflow/job/WorkflowRun at org.jenkinsci.plugins.workflow.job.WorkflowJob$SCMListenerImpl.onCheckout(WorkflowJob.java:750) at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:609) at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86) at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529) at hudson.model.Run.execute(Run.java:1741) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:98) at hudson.model.Executor.run(Executor.java:410)