Error con Theme Tutorial

[Amaro Pesquero]

Hola, estoy siguiendo el siguiente tutorial: https://www.odoo.com/documentation/9.0/howtos/themes.html

todo bien, hasta que llego a la creación de estilos:

<template id="mystyle" name="My style" inherit_id="website.assets_frontend">
    <xpath expr="link[last()]" position="after">
        <link href="/theme folder/static/less/style.less" rel="stylesheet" type="text/less"/>
    </xpath>
</template>

modifico correctamente la ruta, pero me da este error al actualizar el módulo/thema.

Odoo Server Error

Traceback (most recent call last):
  File "/odoo/odoo-server/openerp/http.py", line 643, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/odoo/odoo-server/openerp/http.py", line 680, in dispatch
    result = self._call_function(**self.params)
  File "/odoo/odoo-server/openerp/http.py", line 316, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/odoo/odoo-server/openerp/service/model.py", line 118, in wrapper
    return f(dbname, *args, **kwargs)
  File "/odoo/odoo-server/openerp/http.py", line 309, in checked_call
    result = self.endpoint(*a, **kw)
  File "/odoo/odoo-server/openerp/http.py", line 959, in __call__
    return self.method(*args, **kw)
  File "/odoo/odoo-server/openerp/http.py", line 509, in response_wrap
    response = f(*args, **kw)
  File "/odoo/odoo-server/addons/web/controllers/main.py", line 896, in call_button
    action = self._call_kw(model, method, args, {})
  File "/odoo/odoo-server/addons/web/controllers/main.py", line 884, in _call_kw
    return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
  File "/odoo/odoo-server/openerp/api.py", line 238, in wrapper
    return old_api(self, *args, **kwargs)
  File "/odoo/odoo-server/openerp/addons/base/module/module.py", line 459, in button_immediate_install
    return self._button_immediate_function(cr, uid, ids, self.button_install, context=context)
  File "/odoo/odoo-server/openerp/api.py", line 238, in wrapper
    return old_api(self, *args, **kwargs)
  File "/odoo/odoo-server/openerp/addons/base/module/module.py", line 533, in _button_immediate_function
    registry = openerp.modules.registry.RegistryManager.new(cr.dbname, update_module=True)
  File "/odoo/odoo-server/openerp/modules/registry.py", line 385, in new
    openerp.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/odoo/odoo-server/openerp/modules/loading.py", line 338, in load_modules
    loaded_modules, update_module)
  File "/odoo/odoo-server/openerp/modules/loading.py", line 237, in load_marked_modules
    loaded, processed = load_module_graph(cr, graph, progressdict, report=report, skip_modules=loaded_modules, perform_checks=perform_checks)
  File "/odoo/odoo-server/openerp/modules/loading.py", line 156, in load_module_graph
    _load_data(cr, module_name, idref, mode, kind='data')
  File "/odoo/odoo-server/openerp/modules/loading.py", line 98, in _load_data
    tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)
  File "/odoo/odoo-server/openerp/tools/convert.py", line 852, in convert_file
    convert_xml_import(cr, module, fp, idref, mode, noupdate, report)
  File "/odoo/odoo-server/openerp/tools/convert.py", line 926, in convert_xml_import
    relaxng.assert_(doc)
  File "lxml.etree.pyx", line 3313, in lxml.etree._Validator.assert_ (src/lxml/lxml.etree.c:159862)
AssertionError: Document does not comply with schema

[Amaro Pesquero]

Me autorespondo...

no me dí cuenta de indicar 

<?xml version="1.0" encoding="utf-8" ?>

<openerp>

  <data>

...

</data>

</openerp>