dontEnum() error

I am getting following error when I try to loop through a collection
and get set of child collection. The error is not consistent. Sometime
it shows and sometimes it doesn't. And something I get a heap space
error.  Any ideas?  We are due to launch on oct 1st, so it is
important that we figure what is going on.


Error in application

dontEnum() called with non-String argument

Java Stack

org.mozilla.javascript.EvaluatorException: dontEnum() called with
non-String argument
	at helma.scripting.rhino.RhinoCore.getValidPrototype(RhinoCore.java:403)
	at helma.scripting.rhino.RhinoCore.getNodeWrapper(RhinoCore.java:650)
	at helma.scripting.rhino.RhinoCore$WrapMaker.wrap(RhinoCore.java:1039)
	at org.mozilla.javascript.ScriptRuntime.toObject(ScriptRuntime.java:937)
	at org.mozilla.javascript.ScriptRuntime.toObject(ScriptRuntime.java:885)
	at org.mozilla.javascript.Context.toObject(Context.java:1528)
	at helma.scripting.rhino.RhinoEngine.setGlobals(RhinoEngine.java:203)
	at helma.framework.core.RequestEvaluator.initGlobals(RequestEvaluator.java:993)
	at helma.framework.core.RequestEvaluator.run(RequestEvaluator.java:211)
	at java.lang.Thread.run(Thread.java:613)