Hi, An Instalaltion of Jenkins ran fine until installing the multijob plugin. After a service restart, I get this Java error (as long as the scm-api plugin is present in the plugin directory. Taking it out enables login):

hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException: java.lang.NoClassDefFoundError: jenkins/scm/api/SCMRevisionAction
at hudson.WebAppMain$3.run(WebAppMain.java:244)
Caused by: org.jvnet.hudson.reactor.ReactorException: java.lang.NoClassDefFoundError: jenkins/scm/api/SCMRevisionAction
at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
at jenkins.InitReactorRunner.run(InitReactorRunner.java:45)
at jenkins.model.Jenkins.executeReactor(Jenkins.java:1009)
at jenkins.model.Jenkins.<init>(Jenkins.java:877)
at hudson.model.Hudson.<init>(Hudson.java:85)
at hudson.model.Hudson.<init>(Hudson.java:81)
at hudson.WebAppMain$3.run(WebAppMain.java:227)
Caused by: java.lang.NoClassDefFoundError: jenkins/scm/api/SCMRevisionAction
at org.jenkinsci.plugins.workflow.cps.replay.ReplayAction.<clinit>(ReplayAction.java:157)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:104)
at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:175)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:998)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: jenkins.scm.api.SCMRevisionAction
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1376)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1326)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1079)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 14 more