我正面临着我的jenkins服务器的问题，我尝试在jenkins上安装slack插件，最后面临一些阻止我触发工作的问题。这是日志，任何人都可以告诉我可能出错的地方吗？
Started by user anonymous
Building in workspace /var/lib/jenkins/jobs/avanti-lms-specs/workspace
FATAL:
jenkins.model.Jenkins.getActiveInstance()Ljenkins/model/Jenkins;
java.lang.NoSuchMethodError:
jenkins.model.Jenkins.getActiveInstance()Ljenkins/model/Jenkins;
at org.jenkinsci.plugins.displayurlapi.DisplayURLProvider.getRoot(DisplayURLProvider.java:44)
at org.jenkinsci.plugins.displayurlapi.ClassicDisplayURLProvider.getJobURL(ClassicDisplayURLProvider.java:36)
at org.jenkinsci.plugins.displayurlapi.DisplayURLProvider$DisplayURLProviderImpl.getJobURL(DisplayURLProvider.java:88)
at org.jenkinsci.plugins.displayurlapi.EnvironmentContributorImpl.buildEnvironmentFor(EnvironmentContributorImpl.java:24)
at hudson.model.Job.getEnvironment(Job.java:382)
at hudson.model.AbstractProject.getEnvironment(AbstractProject.java:345)
at hudson.model.Run.getEnvironment(Run.java:2248)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:905)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:883)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1253)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:622)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:528)
at hudson.model.Run.execute(Run.java:1745)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)