[Zope] index error, list index out of range

[suhail shaik]

 some one please help me regarding why the index error is occuring...
i find the application works fine for a few values of textidx but only for a
few distinct values this error occurs....

kindly help me

Traceback (innermost last):

   - Module ZPublisher.Publish, line 119, in publish
   - Module ZPublisher.mapply, line 88, in mapply
   - Module ZPublisher.Publish, line 42, in call_object
   - Module Shared.DC.Scripts.Bindings, line 313, in __call__
   - Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
   - Module Products.PageTemplates.ZopePageTemplate, line 330, in _exec
   - Module Products.PageTemplates.ZopePageTemplate, line 426, in pt_render
   - Module Products.PageTemplates.PageTemplate, line 89, in pt_render
   - Module zope.pagetemplate.pagetemplate, line 117, in pt_render
   - Module zope.tal.talinterpreter, line 271, in __call__
   - Module zope.tal.talinterpreter, line 346, in interpret
   - Module zope.tal.talinterpreter, line 824, in do_loop_tal
   - Module zope.tal.talinterpreter, line 346, in interpret
   - Module zope.tal.talinterpreter, line 536, in do_optTag_tal
   - Module zope.tal.talinterpreter, line 521, in do_optTag
   - Module zope.tal.talinterpreter, line 516, in no_tag
   - Module zope.tal.talinterpreter, line 346, in interpret
   - Module zope.tal.talinterpreter, line 590, in do_setGlobal_tal
   - Module zope.tales.tales, line 696, in evaluate
   *URL: /news/SearchReport*
   *Line 79, Column 2*
   *Expression: <PythonExpr
   container.data.restrictedTraverse(storynb[0]).getChapterInfo(storynb[1],
   kfMax)>*
   *Names:*

   {'container': <Folder at /news>,
    'context': <Folder at /news>,
    'default': <object object at 0xb7d62528>,
    'here': <Folder at /news>,
    'loop': {u'result':
<Products.PageTemplates.Expressions.PathIterator object at
0x1993cfcc>},
    'nothing': None,
    'options': {'args': ()},
    'repeat': <Products.PageTemplates.Expressions.SafeMapping object
at 0x186ab80c>,
    'request': <HTTPRequest,
URL=http://kmi-vid01.open.ac.uk:8080/news/SearchReport>,
    'root': <Application at >,
    'template': <ZopePageTemplate at /news/SearchReport>,
    'traverse_subpath': [],
    'user': <User 'mmis'>}

   - Module Products.PageTemplates.ZRPythonExpr, line 49, in __call__
   __traceback_info__:
   container.data.restrictedTraverse(storynb[0]).getChapterInfo(storynb[1],
   kfMax)
   - Module PythonExpr, line 1, in <expression>
   - Module Shared.DC.Scripts.Bindings, line 313, in __call__
   - Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec
   - Module Products.PythonScripts.PythonScript, line 327, in _exec
   - Module None, line 26, in getChapterInfo
   *<PythonScript at /news/getChapterInfo used for /news/data/20071124>*
   *Line 26*
   - Module AccessControl.ZopeGuards, line 67, in guarded_getitem

IndexError: list index out of range
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