NullPointerException in TypeNode.<init>

[Rohan Lloyd <rohanl@rohanl.com>]

I'm trying to run soot on Mac OS X, and I get the following error:

rohanl@gromit> soot --jimple Hello
Soot started on Sun Jun 01 17:56:58 EST 2003
Transforming Hello... Exception in thread "main"  
java.lang.NullPointerException
        at soot.jimple.toolkits.typing.TypeNode.<init>(TypeNode.java:88)
        at  
soot.jimple.toolkits.typing.ClassHierarchy$ConstructorChooser.caseRefTyp 
e(ClassHierarchy.java:240)
        at soot.RefType.apply(RefType.java:153)
        at  
soot.jimple.toolkits.typing.ClassHierarchy$ConstructorChooser.typeNode(C 
lassHierarchy.java:233)
        at  
soot.jimple.toolkits.typing.ClassHierarchy.typeNode(ClassHierarchy.java: 
129)
        at  
soot.jimple.toolkits.typing.ClassHierarchy.<init>(ClassHierarchy.java:84 
)
        at  
soot.jimple.toolkits.typing.ClassHierarchy.classHierarchy(ClassHierarchy 
.java:107)
        at  
soot.jimple.toolkits.typing.TypeResolver.<init>(TypeResolver.java:157)
        at  
soot.jimple.toolkits.typing.TypeResolver.resolve(TypeResolver.java:180)
        at  
soot.jimple.toolkits.typing.TypeAssigner.internalTransform(TypeAssigner. 
java:59)
        at soot.BodyTransformer.transform(BodyTransformer.java:58)
        at soot.BodyTransformer.transform(BodyTransformer.java:80)
        at soot.jimple.JimpleBody.applyPhaseOptions(JimpleBody.java:118)
        at  
soot.coffi.CoffiMethodSource.getBody(CoffiMethodSource.java:111)
        at soot.SootMethod.getBodyFromMethodSource(SootMethod.java:89)
        at soot.SootMethod.retrieveActiveBody(SootMethod.java:311)
        at soot.Main.handleClass(Main.java:2186)
        at soot.Main.processClasses(Main.java:1775)
        at soot.Main.run(Main.java:1684)
        at soot.Main.main(Main.java:1573)

rohanl@gromit> java -version
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_01-39)
Java HotSpot(TM) Client VM (build 1.4.1_01-14, mixed mode)

rohanl@gromit> soot --version
Soot version 1.2.5
Copyright (C) 1997-2003 Raja Vallee-Rai (rvalleerai@sable.mcgill.ca).
All rights reserved.

Any ideas?

--
Rohan Lloyd