I have this excpetion in the logs. I am assuming it comes from the copyartifact plugin from the backtrace

Feb 11, 2015 8:13:20 AM WARNING hudson.ExtensionFinder$GuiceFinder$SezpozModule configure
Failed to load hudson.plugins.release.dashboard.RecentReleasesPortlet$DescriptorImpl
java.lang.LinkageError: Failed to resolve class hudson.plugins.release.dashboard.RecentReleasesPortlet$DescriptorImpl
at hudson.ExtensionFinder$GuiceFinder$SezpozModule.resolve(ExtensionFinder.java:491)
at hudson.ExtensionFinder$GuiceFinder$SezpozModule.configure(ExtensionFinder.java:524)
at com.google.inject.AbstractModule.configure(AbstractModule.java:62)
at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:253)
at com.google.inject.spi.Elements.getElements(Elements.java:108)
at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.java:135)
at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:104)
at com.google.inject.Guice.createInjector(Guice.java:96)
at com.google.inject.Guice.createInjector(Guice.java:73)
at hudson.ExtensionFinder$GuiceFinder.<init>(ExtensionFinder.java:279)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at java.lang.Class.newInstance(Class.java:379)
at net.java.sezpoz.IndexItem.instance(IndexItem.java:181)
at hudson.ExtensionFinder$Sezpoz._find(ExtensionFinder.java:642)
at hudson.ExtensionFinder$Sezpoz.find(ExtensionFinder.java:617)
at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:371)
at hudson.ExtensionList.load(ExtensionList.java:300)
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:253)
at hudson.ExtensionList.iterator(ExtensionList.java:143)
at hudson.ClassicPluginStrategy.findComponents(ClassicPluginStrategy.java:364)
at hudson.ExtensionList.load(ExtensionList.java:300)
at hudson.ExtensionList.ensureLoaded(ExtensionList.java:253)
at hudson.ExtensionList.iterator(ExtensionList.java:143)
at jenkins.model.Jenkins.getDescriptorByType(Jenkins.java:1191)
at hudson.plugins.copyartifact.BuildSelectorParameter.initAliases(BuildSelectorParameter.java:99)
at hudson.plugins.copyartifact.CopyArtifactPlugin.postInitialize(CopyArtifactPlugin.java:35)
at hudson.PluginManager$2$1$2.run(PluginManager.java:386)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:903)
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:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)