Hi,
 
I'm using *Jenkins ver. 1.518* <http://jenkins-ci.org/> , and I setup a 
slave "testbuild" that is In sync with the master, and when I attempt to 
run a build, the following is generated? Does anyone knows what is the fix 
to this problem?
 
 
Started by user anonymous
Building remotely on testbuild in workspace /tmp/jenkins
hudson.util.IOException2: remote file operation failed: /tmp at 
hudson.remoting.Channel@1bd7921c:testbuild
 at hudson.FilePath.act(FilePath.java:901)
 at hudson.FilePath.act(FilePath.java:878)
 at hudson.scm.AbstractCvs.perform(AbstractCvs.java:226)
 at hudson.scm.AbstractCvs.checkout(AbstractCvs.java:192)
 at hudson.scm.CVSSCM.checkout(CVSSCM.java:323)
 at hudson.model.AbstractProject.checkout(AbstractProject.java:1369)
 at 
hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:676)
 at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:88)
 at 
hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:581)
 at hudson.model.Run.execute(Run.java:1576)
 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
 at hudson.model.ResourceController.execute(ResourceController.java:88)
 at hudson.model.Executor.run(Executor.java:241)
Caused by: java.io.IOException: Remote call on testbuild failed
 at hudson.remoting.Channel.call(Channel.java:681)
 at hudson.FilePath.act(FilePath.java:894)
 ... 12 more
Caused by: java.lang.ClassFormatError: Failed to load 
hudson.scm.AbstractCvs$1
 at 
hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:193)
 at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:144)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:242)
 at 
hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:113)
 at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1543)
 at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1465)
 at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1698)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
 at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1917)
 at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1841)
 at 
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1718)
 at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
 at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
 at hudson.remoting.UserRequest.deserialize(UserRequest.java:182)
 at hudson.remoting.UserRequest.perform(UserRequest.java:98)
 at hudson.remoting.UserRequest.perform(UserRequest.java:48)
 at hudson.remoting.Request$2.run(Request.java:326)
 at 
hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
 at java.util.concurrent.FutureTask.run(FutureTask.java:123)
 at 
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
 at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.UnsupportedClassVersionError: Bad version number in 
.class file
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
 at 
hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:191)
 ... 26 more
Finished: FAILURE

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