I am using hudson Hudson ver 1.294 with vss plugin ver 1.5
I get this exception every now and then. Sometimes it works fine and sometimes
fails with exceptions, without any noticeable reason. I get 2 different types of
exceptions both originated by NullPointerException. This is one of them:

FATAL: null
hudson.util.IOException2
at scm.vss.VSSSCM.getHistoryEntries(VSSSCM.java:429)
at scm.vss.VSSSCM.getHistoryEntries(VSSSCM.java:283)
at scm.vss.VSSSCM.checkout(VSSSCM.java:244)
at hudson.model.AbstractProject.checkout(AbstractProject.java:808)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:314)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:266)
at hudson.model.Run.run(Run.java:899)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)
Caused by: java.lang.NullPointerException
at scm.vss.VSSSCM.getHistoryEntries(VSSSCM.java:417)
... 9 more

And sometimes a slightly different exception:

FATAL: null
hudson.util.IOException2
at scm.vss.VSSSCM.getHistoryEntries(VSSSCM.java:429)
at scm.vss.VSSSCM.getHistoryEntries(VSSSCM.java:283)
at scm.vss.VSSSCM.checkout(VSSSCM.java:244)
at hudson.model.AbstractProject.checkout(AbstractProject.java:808)
at hudson.model.AbstractBuild$AbstractRunner.checkout(AbstractBuild.java:314)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:266)
at hudson.model.Run.run(Run.java:899)
at hudson.model.Build.run(Build.java:112)
at hudson.model.ResourceController.execute(ResourceController.java:93)
at hudson.model.Executor.run(Executor.java:119)
Caused by: java.lang.NullPointerException
at com4j.$Proxy18.next(Unknown Source)
at com4j.ComCollection.fetch(ComCollection.java:60)
at com4j.ComCollection.next(ComCollection.java:38)
at scm.vss.VSSSCM.getHistoryEntries(VSSSCM.java:416)
... 9 more

Hope someone can advise.
Thanks
Assaf