"In heaven everything's fine" trace error

Hello. We're developing on CPS 3.4.2 and we have got a new theme for the
portal. Using the CPS default theme, the normal trace of an error (any
error) is like:

Error Type: KeyError Error Value: 'type_name'
Traceback: 
Traceback (innermost last):
        
        
      *   Module ZPublisher.Publish, line 115, in publish
        
      *   Module ZPublisher.mapply, line 88, in mapply
        
      *   Module ZPublisher.Publish, line 41, in call_object
        
      *   Module Shared.DC.Scripts.Bindings, line 311, in __call__
        
      *   Module Shared.DC.Scripts.Bindings, line 348, in _bindAndExec
        
      *   Module Products.CMFCore.FSPageTemplate, line 195, in _exec
        
      *   Module Products.CMFCore.FSPageTemplate, line 134, in pt_render
        
      *   Module Products.PageTemplates.PageTemplate, line 104, in
        pt_render
        <FSPageTemplate at /cps/cpsdocument_create_form used
for /cps/workspaces/hne-a-8c-loa>
        
      *   Module TAL.TALInterpreter, line 238, in __call__
        
      *   Module TAL.TALInterpreter, line 281, in interpret
        
      *   Module TAL.TALInterpreter, line 507, in do_setLocal_tal
        
      *   Module Products.PageTemplates.TALES, line 221, in evaluate
        
        URL:
file:CPSDocument/skins/cps_document/cpsdocument_create_form.pt
        Line 1, Column 0
        Expression: standard:'request/type_name'
        Names:{'container': <CPSDefaultSite at /cps>,
         'context': <ProxyFolder at /cps/workspaces/hne-a-8c-loa>,
         'default': <Products.PageTemplates.TALES.Default instance at
0xb721212c>,
         'here': <ProxyFolder at /cps/workspaces/hne-a-8c-loa>,
         'loop': <Products.PageTemplates.TALES.SafeMapping object at
0xb2f8a24c>,
         'modules':
<Products.PageTemplates.ZRPythonExpr._SecureModuleImporter instance at
0xb71b81ec>,
         'nothing': None,
         'options': {'args': ()},
         'repeat': <Products.PageTemplates.TALES.SafeMapping object at
0xb2f8a24c>,
         'request': <HTTPRequest,
URL=http://localhost:8008/cps/workspaces/hne-a-8c-loa/cpsdocument_create_form>,
         'root': <Application at >,
         'template': <FSPageTemplate at /cps/cpsdocument_create_form
used for /cps/workspaces/hne-a-8c-loa>,
         'traverse_subpath': [],
         'user': <CPSUser zopeadmin>}
      ...

and so on.

But if we use our new theme, the error trace disapear, showing the
message: "In Heaven Everything's fine..."

We've been looking for a solution, but we're stack. 
Anybody knows why this is happening?

Thanks!!

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