I've upgraded my StarTeam versions to 2008 R2 from 2005 R2 and stcheckout has stopped working.  I've got both the 10.4 SDK bin directory and lib directory in my path.  I'm getting the following error:

BUILD FAILED
java.lang.NoClassDefFoundError: com/starbase/starteam/File
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods (Class.java:2395)
        at java.lang.Class.privateGetPublicMethods (Class.java:2519)
        at java.lang.Class.privateGetPublicMethods (Class.java:2535)
        at java.lang.Class.getMethods (Class.java:1406)
        at org.apache.tools.ant.IntrospectionHelper.<init>(IntrospectionHelper.j
ava:171)
        at org.apache.tools.ant.IntrospectionHelper.getHelper(IntrospectionHelpe
r.java:333)
        at org.apache.tools.ant.RuntimeConfigurable.maybeConfigure(RuntimeConfig
urable.java:381)
        at org.apache.tools.ant.RuntimeConfigurable.maybeConfigure(RuntimeConfig
urable.java:349)
        at org.apache.tools.ant.Task.maybeConfigure (Task.java:202)
        at org.apache.tools.ant.UnknownElement.configure (UnknownElement.java:193
)
        at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.jav
a:160)
        at org.apache.tools.ant.Task.perform (Task.java:347)
        at org.apache.tools.ant.Target.execute (Target.java:357)
        at org.apache.tools.ant.Target.performTasks (Target.java:385)
        at org.apache.tools.ant.Project.executeSortedTargets (Project.java:1337)
        at org.apache.tools.ant.Project.executeTarget (Project.java:1306)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExe
cutor.java:41)
        at org.apache.tools.ant.Project.executeTargets (Project.java:1189)
        at org.apache.tools.ant.Main.runBuild (Main.java:758)
        at org.apache.tools.ant.Main.startAnt (Main.java:217)
        at org.apache.tools.ant.launch.Launcher.run (Launcher.java:257)
        at org.apache.tools.ant.launch.Launcher.main (Launcher.java:104)

Any help?

THanks,
Eric