java.lang.NoSuchMethodError，jenkins插件升级导致问题报错

Started by user test
java.lang.NoSuchMethodError: org.eclipse.jgit.lib.Repository.getRef(Ljava/lang/String;)Lorg/eclipse/jgit/lib/Ref;
    at jenkins.plugins.git.GitSCMFileSystem$1.invoke(GitSCMFileSystem.java:117)
    at jenkins.plugins.git.GitSCMFileSystem$1.invoke(GitSCMFileSystem.java:114)
    at jenkins.plugins.git.GitSCMFileSystem$3.invoke(GitSCMFileSystem.java:193)
    at org.jenkinsci.plugins.gitclient.AbstractGitAPIImpl.withRepository(AbstractGitAPIImpl.java:29)
    at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.withRepository(CliGitAPIImpl.java:80)
    at jenkins.plugins.git.GitSCMFileSystem.invoke(GitSCMFileSystem.java:189)
    at jenkins.plugins.git.GitSCMFileSystem.<init>(GitSCMFileSystem.java:114)
    at jenkins.plugins.git.GitSCMFileSystem$BuilderImpl.build(GitSCMFileSystem.java:353)
    at jenkins.scm.api.SCMFileSystem.of(SCMFileSystem.java:197)
    at jenkins.scm.api.SCMFileSystem.of(SCMFileSystem.java:173)
    at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:115)
    at org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition.create(CpsScmFlowDefinition.java:69)
    at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:293)
    at hudson.model.ResourceController.execute(ResourceController.java:97)
    at hudson.model.Executor.run(Executor.java:429)
Finished: FAILURE

出现上述错误的原因是，部分插件升级未完成。

1.比如上述问题，由于近期升级了jenkins插件导致，后将上述的Git相关插件升级后，问题解决。

2.可将近期升级的插件降级