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java.lang.NullPointerException: 	at hudson.plugins.scm_sync_configuration.scms.SCM.valueOf(SCM.java:146)	at hudson.plugins.scm_sync_configuration.scms.SCM$SCMXStreamConverter.unmarshal(SCM.java:186)	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 hudson.util.RobustReflectionConverter.unmarshalField(RobustReflectionConverter.java:290)	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:233)	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:180)	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:80)	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:912)	at hudson.XmlFile.unmarshal(XmlFile.java:148)	at hudson.Plugin.load(Plugin.java:220)	at hudson.plugins.scm_sync_configuration.ScmSyncConfigurationPlugin.start(ScmSyncConfigurationPlugin.java:49)	at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:303)	at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:292)	at hudson.PluginManager$2$1$1.run(PluginManager.java:275)	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)	at hudson.model.Hudson$3.runTask(Hudson.java:699)	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:619)