exception

hudson.util.IOException2: Slave JVM has not reported exit code. Is it still running?
	at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:953)
	at hudson.plugins.sshslaves.SSHLauncher.access$400(SSHLauncher.java:133)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:711)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:696)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)
Caused by: java.io.IOException: Remote call on sdapdevjsctrl failed
	at hudson.remoting.Channel.call(Channel.java:786)
	at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:493)
	at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:366)
	at hudson.plugins.sshslaves.SSHLauncher.startSlave(SSHLauncher.java:945)
	... 8 more
Caused by: java.lang.ClassFormatError: Failed to load hudson.slaves.SlaveComputer$SlaveVersion
	at hudson.remoting.RemoteClassLoader.loadClassFile(RemoteClassLoader.java:340)
	at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:251)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:113)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1592)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
	at hudson.remoting.UserRequest.deserialize(UserRequest.java:185)
	at hudson.remoting.UserRequest.perform(UserRequest.java:99)
	at hudson.remoting.UserRequest.perform(UserRequest.java:49)
	at hudson.remoting.Request$2.run(Request.java:326)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:679)
	at ......remote call to sdapdevjsctrl(Native Method)
	at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1413)
	at hudson.remoting.UserResponse.retrieve(UserRequest.java:221)
	at hudson.remoting.Channel.call(Channel.java:778)
	... 11 more