Hello, I'm facing an error on installing process for App Live Chat. Maybe someone can help:

Traceback (most recent call last):

  File "/usr/local/src/odoo-source/odoo/http.py", line 638, in _handle_exception

    return super(JsonRequest, self)._handle_exception(exception)

  File "/usr/local/src/odoo-source/odoo/http.py", line 675, in dispatch

    result = self._call_function(**self.params)

  File "/usr/local/src/odoo-source/odoo/http.py", line 331, in _call_function

    return checked_call(self.db, *args, **kwargs)

  File "/usr/local/src/odoo-source/odoo/service/model.py", line 119, in wrapper

    return f(dbname, *args, **kwargs)

  File "/usr/local/src/odoo-source/odoo/http.py", line 324, in checked_call

    result = self.endpoint(*a, **kw)

  File "/usr/local/src/odoo-source/odoo/http.py", line 933, in __call__

    return self.method(*args, **kw)

  File "/usr/local/src/odoo-source/odoo/http.py", line 504, in response_wrap

    response = f(*args, **kw)

  File "/usr/local/src/odoo-source/addons/web/controllers/main.py", line 882, in call_button

    action = self._call_kw(model, method, args, {})

  File "/usr/local/src/odoo-source/addons/web/controllers/main.py", line 870, in _call_kw

    return call_kw(request.env[model], method, args, kwargs)

  File "/usr/local/src/odoo-source/odoo/api.py", line 681, in call_kw

    return call_kw_multi(method, model, args, kwargs)

  File "/usr/local/src/odoo-source/odoo/api.py", line 672, in call_kw_multi

    result = method(recs, *args, **kwargs)

  File "/usr/local/src/odoo-source/odoo/addons/base/module/module.py", line 410, in button_immediate_install

    return self._button_immediate_function(type(self).button_install)

  File "/usr/local/src/odoo-source/odoo/addons/base/module/module.py", line 484, in _button_immediate_function

    modules.registry.Registry.new(self._cr.dbname, update_module=True)

  File "/usr/local/src/odoo-source/odoo/modules/registry.py", line 78, in new

    odoo.modules.load_modules(registry._db, force_demo, status, update_module)

  File "/usr/local/src/odoo-source/odoo/modules/loading.py", line 339, in load_modules

    loaded_modules, update_module)

  File "/usr/local/src/odoo-source/odoo/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 "/usr/local/src/odoo-source/odoo/modules/loading.py", line 156, in load_module_graph

    _load_data(cr, module_name, idref, mode, kind='data')

  File "/usr/local/src/odoo-source/odoo/modules/loading.py", line 95, in _load_data

    tools.convert_file(cr, module_name, filename, idref, mode, noupdate, kind, report)

  File "/usr/local/src/odoo-source/odoo/tools/convert.py", line 848, in convert_file

    convert_xml_import(cr, module, fp, idref, mode, noupdate, report)

  File "/usr/local/src/odoo-source/odoo/tools/convert.py", line 918, in convert_xml_import

    obj.parse(doc.getroot(), mode=mode)

  File "/usr/local/src/odoo-source/odoo/tools/convert.py", line 799, in parse

    self.parse(rec, mode)

  File "/usr/local/src/odoo-source/odoo/tools/convert.py", line 802, in parse

    self._tags[rec.tag](rec, de, mode=mode)

  File "/usr/local/src/odoo-source/odoo/tools/convert.py", line 780, in _tag_template

    return self._tag_record(record, data_node)

  File "/usr/local/src/odoo-source/odoo/tools/convert.py", line 710, in _tag_record

    id = self.env(context=rec_context)['ir.model.data']._update(rec_model, self.module, res, rec_id or False, not self.isnoupdate(data_node), noupdate=self.isnoupdate(data_node), mode=self.mode)

  File "/usr/local/src/odoo-source/odoo/addons/base/ir/ir_model.py", line 1192, in _update

    record = record.create(values)

  File "/usr/local/src/odoo-source/odoo/addons/base/ir/ir_ui_view.py", line 353, in create

    return super(View, self).create(self._compute_defaults(values))

  File "/usr/local/src/odoo-source/odoo/models.py", line 3818, in create

    self._fields[key].determine_inverse(record)

  File "/usr/local/src/odoo-source/odoo/fields.py", line 999, in determine_inverse

    getattr(records, self.inverse)()

  File "/usr/local/src/odoo-source/odoo/addons/base/ir/ir_ui_view.py", line 220, in _inverse_arch

    view.write(data)

  File "/usr/local/src/odoo-source/odoo/addons/base/ir/ir_ui_view.py", line 371, in write

    return super(View, self).write(self._compute_defaults(vals))

  File "/usr/local/src/odoo-source/odoo/models.py", line 3550, in write

    self._write(old_vals)

  File "/usr/local/src/odoo-source/odoo/models.py", line 3696, in _write

    self._validate_fields(vals)

  File "/usr/local/src/odoo-source/odoo/models.py", line 1074, in _validate_fields

    raise ValidationError("%s\n\n%s" % (_("Error while validating constraint"), tools.ustr(e)))

ParseError: "Error while validating constraint

Element '<xpath expr="//ul[@id='products']">' cannot be located in parent view

Error context:

View `Footer Rating Livechat Link`

[view_id: 1075, xml_id: n/a, model: n/a, parent_id: 234]

None" while parsing None:33, near

<data inherit_id="website.footer_default" name="Footer Rating Livechat Link">

            <xpath expr="//ul[@id='products']" position="inside">

                <li><a href="/livechat/">Livechat Support</a></li>

            </xpath>

        </data>