I cannot import external themes

Hi all:

I'm trying to import external themes following the next steps:

0. Create a new File in the  Portal containing the *.zexp file generated 
by the theme exporting tool.

1. Add a new theme:

  ID: printable
  Theme URL: 
http://localhost:8081/webgen/workspaces/otrotheme/downloadFile/file/printable.zexp

2. Click on check for Updates. I get the "New theme available!" on the 
"Status" column.

3. Check my "printable" theme and click on "Install updates".

4. I get next error:

Error Type: 	ExportError
Error Value: 	

Invalid export header

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 Products.CPSSkins.PortalThemesTool, line 1432, in
      manage_updateExternalThemes
    * Module Products.CPSSkins.PortalThemesTool, line 1362, in
      installExternalTheme
    * Module OFS.ObjectManager, line 588, in manage_importObject
    * Module OFS.ObjectManager, line 605, in _importObjectFromFile
    * Module ZODB.ExportImport, line 66, in importFile

ExportError: Invalid export header

Anyone knows why ??

NOTE: I've tried with *.zexp and *.xml formats and anyone runs.

Thanks in advance.

--

-- 
David Macias Carvajal.
Dpto I+D.
Yerbabuena Software.
davidmacias@...
http://www.yerbabuena.es
Tlf/Fax: 902 995 246 

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