We just installed clearcase 1.1 plugin and the polling fails as it is not resolving the ${NODE_NAME} variable when executing the lshistory command. It works when you manually kick off a build though.

From the logs:

INFO | jvm 1 | 2010/01/08 08:30:55 | Jan 8, 2010 8:30:55 AM hudson.plugins.clearcase.ClearCaseSCM createHistoryAction
INFO | jvm 1 | 2010/01/08 08:30:55 | WARNING: Exception when running 'cleartool pwv'
INFO | jvm 1 | 2010/01/08 08:30:55 | java.io.IOException: Cannot run program "cleartool" (in directory "/opt/devlocal/hudson/workspace/eit-insight-desktop-2.5-ci/hudson_${NODE_NAME}_eit-insight-desktop-2.5-ci"): java.io.IOException: error=2, No such file or directory
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.Proc$LocalProc.<init>(Proc.java:145)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.Proc$LocalProc.<init>(Proc.java:118)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.Launcher$LocalLauncher.launch(Launcher.java:633)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.Launcher$ProcStarter.start(Launcher.java:268)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:775)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:753)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.remoting.UserRequest.perform(UserRequest.java:104)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.remoting.UserRequest.perform(UserRequest.java:48)
INFO | jvm 1 | 2010/01/08 08:30:55 | at hudson.remoting.Request$2.run(Request.java:244)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.util.concurrent.FutureTask.run(FutureTask.java:138)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.lang.Thread.run(Thread.java:619)
INFO | jvm 1 | 2010/01/08 08:30:55 | Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.lang.ProcessImpl.start(ProcessImpl.java:65)
INFO | jvm 1 | 2010/01/08 08:30:55 | at java.lang.ProcessBuilder.start(ProcessBuilder.java:452)
INFO | jvm 1 | 2010/01/08 08:30:55 | ... 15 more
INFO | jvm 1 | 2010/01/08 08:30:55 | Jan 8, 2010 8:30:55 AM hudson.plugins.clearcase.util.BuildVariableResolver resolve
INFO | jvm 1 | 2010/01/08 08:30:55 | WARNING: Variable name 'NODE_NAME' look up failed because of java.lang.NullPointerException