java.lang.IllegalStateException: no parent set on org.jenkinsci.plugins.workflow.job.WorkflowJob

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      I have recently created a new Jenkinsfile on Jenkins-on-Jenkins, and the CI didn't start after that due to whatever reason. The ComputedFolder was created, but I got the following for the branch scan:

      Pull request #309 updated in repository mesos-plugin
[Wed Jan 10 17:06:41 GMT 2018] Starting branch indexing...
17:06:41 Connecting to https://api.github.com using jenkinsadmin/****** (GitHub access token for jenkinsadmin)
17:06:41 Connecting to https://api.github.com using jenkinsadmin/****** (GitHub access token for jenkinsadmin)
Examining jenkinsci/mesos-plugin

  Checking branches...

  Getting remote branches...

    Checking branch gh-pages
      ‘Jenkinsfile’ not found
    Does not meet criteria

    Checking branch master
      ‘Jenkinsfile’ not found
    Does not meet criteria

  2 branches were processed

  Checking pull-requests...

  Getting remote pull requests...

    Checking pull request #309
      ‘Jenkinsfile’ found
    Met criteria
ERROR: [Wed Jan 10 17:06:45 GMT 2018] Could not fetch branches from source org.jenkinsci.plugins.github_branch_source.GitHubSCMNavigator::https://api.github.com::jenkinsci::mesos-plugin
java.lang.IllegalStateException: no parent set on org.jenkinsci.plugins.workflow.job.WorkflowJob[PR-309]
	at hudson.model.AbstractItem.getParent(AbstractItem.java:201)
	at hudson.model.AbstractItem.getRootDir(AbstractItem.java:192)
	at hudson.model.Items.getConfigFile(Items.java:387)
	at hudson.model.AbstractItem.getConfigFile(AbstractItem.java:505)
	at hudson.model.AbstractItem.save(AbstractItem.java:500)
	at hudson.model.Job.save(Job.java:196)
	at org.jenkinsci.plugins.workflow.job.WorkflowJob.setDefinition(WorkflowJob.java:169)
	at org.jenkinsci.plugins.workflow.multibranch.AbstractWorkflowBranchProjectFactory.setBranch(AbstractWorkflowBranchProjectFactory.java:63)
	at org.jenkinsci.plugins.workflow.multibranch.AbstractWorkflowBranchProjectFactory.newInstance(AbstractWorkflowBranchProjectFactory.java:54)
	at org.jenkinsci.plugins.workflow.multibranch.AbstractWorkflowBranchProjectFactory.newInstance(AbstractWorkflowBranchProjectFactory.java:44)
	at jenkins.branch.MultiBranchProject$SCMHeadObserverImpl.observe(MultiBranchProject.java:2161)
	at jenkins.scm.api.trait.SCMSourceRequest.process(SCMSourceRequest.java:359)
	at org.jenkinsci.plugins.github_branch_source.GitHubSCMSource.retrieve(GitHubSCMSource.java:928)
	at jenkins.scm.api.SCMSource._retrieve(SCMSource.java:355)
	at jenkins.scm.api.SCMSource.fetch(SCMSource.java:265)
	at jenkins.branch.MultiBranchProject.computeChildren(MultiBranchProject.java:634)
	at com.cloudbees.hudson.plugins.folder.computed.ComputedFolder.updateChildren(ComputedFolder.java:276)
	at com.cloudbees.hudson.plugins.folder.computed.FolderComputation.run(FolderComputation.java:165)
	at jenkins.branch.MultiBranchProject$BranchIndexing.run(MultiBranchProject.java:1025)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:421)
[Wed Jan 10 17:06:45 GMT 2018] Finished branch indexing. Indexing took 3.6 sec
FATAL: Failed to recompute children of Plugins » mesos-plugin
java.lang.IllegalStateException: no parent set on org.jenkinsci.plugins.workflow.job.WorkflowJob[PR-309]
	at hudson.model.AbstractItem.getParent(AbstractItem.java:201)
	at hudson.model.AbstractItem.getRootDir(AbstractItem.java:192)
	at hudson.model.Items.getConfigFile(Items.java:387)
	at hudson.model.AbstractItem.getConfigFile(AbstractItem.java:505)
	at hudson.model.AbstractItem.save(AbstractItem.java:500)
	at hudson.model.Job.save(Job.java:196)
	at org.jenkinsci.plugins.workflow.job.WorkflowJob.setDefinition(WorkflowJob.java:169)
	at org.jenkinsci.plugins.workflow.multibranch.AbstractWorkflowBranchProjectFactory.setBranch(AbstractWorkflowBranchProjectFactory.java:63)
	at org.jenkinsci.plugins.workflow.multibranch.AbstractWorkflowBranchProjectFactory.newInstance(AbstractWorkflowBranchProjectFactory.java:54)
	at org.jenkinsci.plugins.workflow.multibranch.AbstractWorkflowBranchProjectFactory.newInstance(AbstractWorkflowBranchProjectFactory.java:44)
	at jenkins.branch.MultiBranchProject$SCMHeadObserverImpl.observe(MultiBranchProject.java:2161)
	at jenkins.scm.api.trait.SCMSourceRequest.process(SCMSourceRequest.java:359)
	at org.jenkinsci.plugins.github_branch_source.GitHubSCMSource.retrieve(GitHubSCMSource.java:928)
	at jenkins.scm.api.SCMSource._retrieve(SCMSource.java:355)
	at jenkins.scm.api.SCMSource.fetch(SCMSource.java:265)
	at jenkins.branch.MultiBranchProject.computeChildren(MultiBranchProject.java:634)
	at com.cloudbees.hudson.plugins.folder.computed.ComputedFolder.updateChildren(ComputedFolder.java:276)
	at com.cloudbees.hudson.plugins.folder.computed.FolderComputation.run(FolderComputation.java:165)
	at jenkins.branch.MultiBranchProject$BranchIndexing.run(MultiBranchProject.java:1025)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:421)
Finished: FAILURE

            Assignee:
            Jesse Glick
            Reporter:
            Oleg Nenashev
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: