Import Team Project Set throws IllegalArgumentException

When I try to import a .psf file into Eclipse, the operation aborts
after processing some of the first project. An IllegalArgumentException
is being thrown. I am using eclipse version 3.1.2 and subclipse version
1.0.3 on windows 2000.
Is this a known bug?

 The .psf file and exception trace are below:
----------------------
<?xml version="1.0" encoding="UTF-8"?>
<psf version="2.0">
    <provider id="org.tigris.subversion.subclipse.core.svnnature">
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/build-poirot/trunk,build-poirot"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/ovm/trunk,ovm"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/poirot/trunk,poirot"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/poirot-common/trunk,poirot-common"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/extlib/trunk,poirot-extlib"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/poirot-glue/trunk,poirot-glue"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/poirot-remote/trunk,poirot-remote"/>
        <project
reference="0.9.3,svn+ssh://poirot.bbn.com/svn/poirot/core/poirot-soap-clients/trunk,poirot-soap-clients"/>
    </provider>
</psf>
It also fails using http urls.
------------------------------------------
!SESSION 2006-06-29 07:55:03.722
-----------------------------------------------
eclipse.buildId=M20060118-1600
java.version=1.5.0_06
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Command-line arguments: -os win32 -ws win32 -arch x86 -data
C:\poirotEclipse

!ENTRY org.eclipse.ui 4 4 2006-06-29 07:55:53.409
!MESSAGE Unhandled event loop exception

!ENTRY org.eclipse.ui 4 0 2006-06-29 07:55:53.425
!MESSAGE Attempted to endRule: null, does not match most recent begin:
P/build-poirot. See log for trace information if rule tracing is enabled.
!STACK 0
java.lang.IllegalArgumentException: Attempted to endRule: null, does not
match most recent begin: P/build-poirot. See log for trace information
if rule tracing is enabled.
    at org.eclipse.core.internal.runtime.Assert.isLegal(Assert.java:58)
    at
org.eclipse.core.internal.jobs.ThreadJob.illegalPop(ThreadJob.java:99)
    at org.eclipse.core.internal.jobs.ThreadJob.pop(ThreadJob.java:204)
    at
org.eclipse.core.internal.jobs.ImplicitJobs.end(ImplicitJobs.java:115)
    at
org.eclipse.core.internal.jobs.JobManager.endRule(JobManager.java:487)
    at
org.eclipse.core.internal.resources.WorkManager.checkOut(WorkManager.java:120)
    at
org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:928)
    at
org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1730)
    at
org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:110)
    at
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)

-- 
Ray Tomlinson
BBN Technologies
10 Moulton St.
Cambridge, MA 02138
(617) 873-3363
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