After recent update of the Active Choices plugin from version 2.1 to version 2.2 Jenkins crashes on startup.

It shows following error in the browser:

 Error

java.lang.IllegalStateException: Expected 1 instance of hudson.PluginManager$PluginUpdateMonitor but got 0 at hudson.ExtensionList.lookupSingleton(ExtensionList.java:451) at hudson.PluginManager$PluginUpdateMonitor.getInstance(PluginManager.java:2188) at hudson.maven.PluginImpl.init(PluginImpl.java:58) Caused: java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:104) Caused: java.lang.Error at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110) at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:175) at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296) at jenkins.model.Jenkins$5.runTask(Jenkins.java:1095) at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214) at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:834) Caused: org.jvnet.hudson.reactor.ReactorException at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:282) at jenkins.InitReactorRunner.run(InitReactorRunner.java:48) at jenkins.model.Jenkins.executeReactor(Jenkins.java:1129) at jenkins.model.Jenkins.<init>(Jenkins.java:936) at hudson.model.Hudson.<init>(Hudson.java:85) at hudson.model.Hudson.<init>(Hudson.java:81) at hudson.WebAppMain$3.run(WebAppMain.java:233) Caused: hudson.util.HudsonFailedToLoad at hudson.WebAppMain$3.run(WebAppMain.java:250)

Relevant part of the log file is attached.

Reverting back to version 2.1 solves the issue:

cd jenkins_home/plugins

sudo mv uno-choice.{bak,jpi}

sudo systemctl stop jenkins

sudo systemctl start jenkins