Build extract problem after migration to 1.0

Hi, after a recent migration from RTC M5a to 1.0, when we run our Ant based build script, we get the following error. Note that we are not using a build engine to kick off the build script, but are using the build toolkit Ant tasks for fetching. We have updated the JBE package that includes the toolkit we're using to 1.0 level.

Accepted 8 change sets.
Discarded 0 change sets.
Added 0 new components.
Dropped 0 components.
Created snapshot "snapshot.B20080808-0157".
Change sets serialized to "D:\rdi75\extract\changesets.B20080808-0157.txt".
Deleting directory D:\rdi75\extract\jazz
Fetching contents of workspace "RDi 7.5 Build" to "D:\rdi75\extract\jazz".
java.lang.IllegalArgumentException
at com.ibm.team.filesystem.client.internal.FileItemInfo.<init>(FileItemInfo.java:254)
at com.ibm.team.filesystem.client.internal.InverseFileItemInfo.<init>(InverseFileItemInfo.java:71)
at com.ibm.team.filesystem.client.internal.copyfileareas.CopyFileAreaStore.setItemInfo(CopyFileAreaStore.java:561)
at com.ibm.team.filesystem.client.internal.SharingManager.share(SharingManager.java:200)
at com.ibm.team.filesystem.client.internal.Shareable.share(Shareable.java:119)
at com.ibm.team.filesystem.client.internal.Shareable.share(Shareable.java:86)
at com.ibm.team.filesystem.client.internal.load.MergeLoadMutator.createFolder(MergeLoadMutator.java:919)
at com.ibm.team.filesystem.client.internal.load.MergeLoadMutator.execute(MergeLoadMutator.java:479)
at com.ibm.team.filesystem.client.internal.operations.FileSystemOperation.run(FileSystemOperation.java:89)
at com.ibm.team.filesystem.client.internal.operations.LoadOperation.load(LoadOperation.java:726)
at com.ibm.team.filesystem.client.internal.operations.LoadOperation.doLoad(LoadOperation.java:433)
at com.ibm.team.filesystem.client.internal.operations.LocalFileSystemLoadOperation.execute(LocalFileSystemLoadOperation.java:97)
at com.ibm.team.filesystem.client.internal.operations.FileSystemOperation.run(FileSystemOperation.java:89)
at com.ibm.team.build.internal.scm.SourceControlUtility.updateFileCopyArea(SourceControlUtility.java:279)
at com.ibm.team.build.internal.scm.SourceControlUtility.updateFileCopyArea(SourceControlUtility.java:166)
at com.ibm.team.build.ant.task.TeamFetchTask.doExecute(TeamFetchTask.java:124)
at com.ibm.team.build.ant.task.AbstractTeamBuildTask.execute(AbstractTeamBuildTask.java:419)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:37)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:382)
at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:107)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.tools.ant.Target.performTasks(Target.java:369)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
at org.apache.tools.ant.Main.runBuild(Main.java:668)
at org.apache.tools.ant.Main.startAnt(Main.java:187)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)