Problems (string index out of range) when generating HelmaDoc

Hi List!

I'm trying to generate the Helma Doc for an app of mine.
The first time i hit the "renderAPI" and whenever i hit the "showApi" 
link in manage i get a lot of exceptions in my logfile like this one:

113172 [TX-manage] ERROR helma.myapp.event  - Couldn't parse file 
C:\data\helma\helma\apps\myapp\modLicense\code\objectFunctions.js
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1938)
        at java.lang.String.substring(String.java:1905)
        at helma.doc.Util.extractString(Util.java:85)
        at helma.doc.DocFunction.scanFunctions(DocFunction.java:110)
        at helma.doc.DocFunction.newFunctions(DocFunction.java:84)
        at helma.doc.DocPrototype.readFiles(DocPrototype.java:100)
        at helma.doc.DocApplication.readApplication(DocApplication.java:103)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:149)
        at 
org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:204)
        at 
org.mozilla.javascript.optimizer.OptRuntime.callProp0(OptRuntime.java:119)
        at 
org.mozilla.javascript.gen.c299._c1(C:\data\helma\helma\apps\manage\DocApplication\actions.js:2)
        at 
org.mozilla.javascript.gen.c299.call(C:\data\helma\helma\apps\manage\DocApplication\actions.js)
        at 
org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:386)
        at 
org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:2772)
        at 
org.mozilla.javascript.gen.c299.call(C:\data\helma\helma\apps\manage\DocApplication\actions.js)
        at org.mozilla.javascript.Context.call(Context.java:520)
        at helma.scripting.rhino.RhinoEngine.invoke(RhinoEngine.java:278)
        at 
helma.framework.core.RequestEvaluator.run(RequestEvaluator.java:384)
        at java.lang.Thread.run(Thread.java:619)


In the webbrowser i get the following:
rendering API ...
wrote 1186 files

so, no error messages here.

the apidoc is somehow generated, but it seems that nearly no macros, 
skins or actions are included. i have all the skins and type.properties 
in the apidoc but nothing about the actual code.
has anyone else this problem? is this some helma-issue or is it a 
problem with my application?

thanks for every hint,
Anton