Getting the following in the system log at startup. Not sure of the ramifications.

Nov 2, 2012 9:23:30 AM hudson.util.RobustReflectionConverter doUnmarshal
WARNING: Failed to resolve a type
java.lang.InstantiationError: hudson.scm.AbstractCvs
at sun.reflect.GeneratedSerializationConstructorAccessor507.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.thoughtworks.xstream.converters.reflection.Sun14ReflectionProvider.newInstance(Sun14ReflectionProvider.java:76)
at hudson.util.RobustReflectionConverter.instantiateNewInstance(RobustReflectionConverter.java:375)
at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:220)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:63)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)
at hudson.util.RobustReflectionConverter.unmarshalField(RobustReflectionConverter.java:332)
at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:274)
at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:221)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:63)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:60)
at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71)
at hudson.util.RobustCollectionConverter.populateCollection(RobustCollectionConverter.java:85)
at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:61)
at hudson.util.RobustCollectionConverter.unmarshal(RobustCollectionConverter.java:76)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:63)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)
at hudson.util.RobustReflectionConverter.unmarshalField(RobustReflectionConverter.java:332)
at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:274)
at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:221)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:82)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:63)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:76)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:60)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:137)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:33)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:926)
at hudson.util.XStream2.unmarshal(XStream2.java:103)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:912)
at hudson.XmlFile.unmarshal(XmlFile.java:160)
at hudson.model.Run.reload(Run.java:291)
at hudson.model.Run.<init>(Run.java:280)
at hudson.model.AbstractBuild.<init>(AbstractBuild.java:182)
at hudson.model.Build.<init>(Build.java:103)
at hudson.model.FreeStyleBuild.<init>(FreeStyleBuild.java:41)
at sun.reflect.GeneratedConstructorAccessor33.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at hudson.model.AbstractProject.loadBuild(AbstractProject.java:1061)
at hudson.model.AbstractProject$1.create(AbstractProject.java:275)
at hudson.model.AbstractProject$1.create(AbstractProject.java:273)
at hudson.model.RunMap.retrieve(RunMap.java:220)
at hudson.model.RunMap.retrieve(RunMap.java:59)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:638)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:621)
at jenkins.model.lazy.AbstractLazyLoadRunMap.all(AbstractLazyLoadRunMap.java:574)
at jenkins.model.lazy.AbstractLazyLoadRunMap.entrySet(AbstractLazyLoadRunMap.java:240)
at java.util.AbstractMap$2$1.<init>(AbstractMap.java:353)
at java.util.AbstractMap$2.iterator(AbstractMap.java:352)
at hudson.util.RunList.iterator(RunList.java:103)
at org.jvnet.hudson.plugins.DownStreamProjectActionFactory.createFor(DownStreamProjectActionFactory.java:59)
at hudson.model.AbstractProject.createTransientActions(AbstractProject.java:675)
at hudson.model.Project.createTransientActions(Project.java:208)
at hudson.model.AbstractProject.updateTransientActions(AbstractProject.java:665)
at hudson.model.AbstractProject.onLoad(AbstractProject.java:299)
at hudson.model.Project.onLoad(Project.java:88)
at hudson.model.Items.load(Items.java:221)
at jenkins.model.Jenkins$17.run(Jenkins.java:2507)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:883)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)