Odoo Server Error

Traceback (most recent call last):
  File "/odoo/odoo-server/openerp/http.py", line 605, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/odoo/odoo-server/openerp/http.py", line 642, 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 893, in __call__
    return self.method(*args, **kw)
  File "/odoo/odoo-server/openerp/http.py", line 471, 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 939, in convert_xml_import
    obj.parse(doc.getroot(), mode=mode)
  File "/odoo/odoo-server/openerp/tools/convert.py", line 802, in parse
    self.parse(rec, mode)
  File "/odoo/odoo-server/openerp/tools/convert.py", line 805, in parse
    self._tags[rec.tag](self.cr, rec, de, mode=mode)
  File "/odoo/odoo-server/openerp/tools/convert.py", line 709, in _tag_record
    id = self.pool['ir.model.data']._update(cr, self.uid, rec_model, self.module, res, rec_id or False, not self.isnoupdate(data_node), noupdate=self.isnoupdate(data_node), mode=self.mode, context=rec_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/ir/ir_model.py", line 1101, in _update
    res_id = model_obj.create(cr, uid, values, 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/ir/ir_ui_view.py", line 351, in create
    context=context)
  File "/odoo/odoo-server/openerp/api.py", line 238, in wrapper
    return old_api(self, *args, **kwargs)
  File "/odoo/odoo-server/openerp/api.py", line 342, in old_api
    result = method(recs, *args, **kwargs)
  File "/odoo/odoo-server/openerp/models.py", line 4132, in create
    record = self.browse(self._create(old_vals))
  File "/odoo/odoo-server/openerp/api.py", line 236, in wrapper
    return new_api(self, *args, **kwargs)
  File "/odoo/odoo-server/openerp/api.py", line 478, in new_api
    result = method(self._model, cr, uid, *args, **old_kwargs)
  File "/odoo/odoo-server/openerp/models.py", line 4323, in _create
    recs._validate_fields(vals)
  File "/odoo/odoo-server/openerp/api.py", line 236, in wrapper
    return new_api(self, *args, **kwargs)
  File "/odoo/odoo-server/openerp/models.py", line 1272, in _validate_fields
    raise ValidationError('\n'.join(errors))
ParseError: "Invalid view definition

Error details:
View inheritance may not use attribute 'string' as a selector.

Error context:
View `config.es.toponyms`
[view_id: 984, xml_id: n/a, model: config.es.toponyms, parent_id: 3]
None" while parsing /odoo/custom/addons/l10n_es_toponyms/wizard/l10n_es_toponyms_wizard.xml:5, near
<record id="view_confirm_toponyms_es_form" model="ir.ui.view">
            <field name="name">config.es.toponyms</field>
            <field name="model">config.es.toponyms</field>
            <field name="inherit_id" ref="base.res_config_installer"/>
            <field name="arch" type="xml">
                <data>
                    <form position="attributes">
                        <attribute name="string">Spanish states and cities configuration</attribute>
                    </form>
                    <separator string="title" position="replace">
                        <group col="2" colspan="4" string="Select the toponym version of the spanish states">
                            <field name="state"/>
                            <label colspan="2" string="For example: Official (Girona), Spanish (Gerona), Both (Gerona / Girona)" align="0.0"/>
                        </group>
                        <label colspan="4" string=""/>
                        <group col="2" colspan="4" string="Associate city and state information to zip codes">
                            <label colspan="2" string="'State', 'City', 'ZIP' and 'Country' fields can be filled automatically in partner, contact and company screens when you enter a zip code or the city name if this information is associated. Do you want to associate this data?"/>
                            <field name="city_info"/>
                            <label colspan="2" string="Warning! Adding this bunch of records can take a lot of time. If you are behind a SSL proxy, check your timeout."/>
                        </group>
                    </separator>

                    <button string="Install Modules" position="after">
                        <button string="Configure from local" type="object" name="execute_local"/>
                    </button>
                    <button string="Install Modules" position="attributes">
                        <attribute name="string">Configure from GeoNames</attribute>
                    </button>
                </data>
            </field>
        </record>