I'm relatively new to Hudson. There is a particular job that would fail out with the below shown exception but the other jobs would not. This happens with a hit rate of 100% and not an one-off issue. I fear it could be due to a erroneous string parsing while going through the output of 'p4 describe'. If I change the "last changelist to track' to the latest changelist so as to avoid a lot of 'p4 describe' tasks and as expected it just goes through fine.
If the above speculaion is true then is there a way to track down using hudson logs(where would this be?) on which string does this happen?

Caught exception communicating with perforce. Failed to retrieve changelist.com.tek42.perforce.PerforceException: Failed to retrieve changelist.
at com.tek42.perforce.parse.ChangelistBuilder.build(ChangelistBuilder.java:185)
at com.tek42.perforce.parse.Changes.getChangelist(Changes.java:63)
at com.tek42.perforce.parse.Changes.getChangelistsFromNumbers(Changes.java:381)
at hudson.plugins.perforce.PerforceSCM.checkout(PerforceSCM.java:565)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1116)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:479)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:411)
at hudson.model.Run.run(Run.java:1324)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:139)
Caused by: java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(StringTokenizer.java:332)
at com.tek42.perforce.parse.ChangelistBuilder.build(ChangelistBuilder.java:95)
... 10 more
ERROR: Unable to communicate with perforce. Failed to retrieve changelist.