i cant install purchase app in Odoo 14 this error happen when i install

Error:

Odoo Server Error

Traceback (most recent call last):

  File "/odoo/odoo-server/odoo/addons/base/models/ir_http.py", line 237, in _dispatch

    result = request.dispatch()

  File "/odoo/odoo-server/odoo/http.py", line 682, in dispatch

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

  File "/odoo/odoo-server/odoo/http.py", line 358, in _call_function

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

  File "/odoo/odoo-server/odoo/service/model.py", line 94, in wrapper

    return f(dbname, *args, **kwargs)

  File "/odoo/odoo-server/odoo/http.py", line 346, in checked_call

    result = self.endpoint(*a, **kw)

  File "/odoo/odoo-server/odoo/http.py", line 911, in __call__

    return self.method(*args, **kw)

  File "/odoo/odoo-server/odoo/http.py", line 530, in response_wrap

    response = f(*args, **kw)

  File "/odoo/odoo14e/web/controllers/main.py", line 1363, in call_button

    action = self._call_kw(model, method, args, kwargs)

  File "/odoo/odoo14e/web/controllers/main.py", line 1351, in _call_kw

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

  File "/odoo/odoo-server/odoo/api.py", line 396, in call_kw

    result = _call_kw_multi(method, model, args, kwargs)

  File "/odoo/odoo-server/odoo/api.py", line 383, in _call_kw_multi

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

  File "<decorator-gen-71>", line 2, in button_immediate_install

  File "/odoo/odoo-server/odoo/addons/base/models/ir_module.py", line 73, in check_and_log

    return method(self, *args, **kwargs)

  File "/odoo/odoo-server/odoo/addons/base/models/ir_module.py", line 474, in button_immediate_install

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

  File "/odoo/odoo-server/odoo/addons/base/models/ir_module.py", line 592, in _button_immediate_function

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

  File "/odoo/odoo-server/odoo/modules/registry.py", line 89, in new

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

  File "/odoo/odoo-server/odoo/modules/loading.py", line 455, in load_modules

    loaded_modules, update_module, models_to_check)

  File "/odoo/odoo-server/odoo/modules/loading.py", line 348, in load_marked_modules

    perform_checks=perform_checks, models_to_check=models_to_check

  File "/odoo/odoo-server/odoo/modules/loading.py", line 221, in load_module_graph

    load_data(cr, idref, mode, kind='data', package=package)

  File "/odoo/odoo-server/odoo/modules/loading.py", line 69, in load_data

    tools.convert_file(cr, package.name, filename, idref, mode, noupdate, kind)

  File "/odoo/odoo-server/odoo/tools/convert.py", line 733, in convert_file

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

  File "/odoo/odoo-server/odoo/tools/convert.py", line 799, in convert_xml_import

    obj.parse(doc.getroot())

  File "/odoo/odoo-server/odoo/tools/convert.py", line 719, in parse

    self._tag_root(de)

  File "/odoo/odoo-server/odoo/tools/convert.py", line 677, in _tag_root

    f(rec)

  File "/odoo/odoo-server/odoo/tools/convert.py", line 684, in _tag_root

    etree.tostring(rec, encoding='unicode').rstrip()

Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):

  File "/odoo/odoo-server/odoo/http.py", line 638, in _handle_exception

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

  File "/odoo/odoo-server/odoo/http.py", line 314, in _handle_exception

    raise exception.with_traceback(None) from new_cause

odoo.tools.convert.ParseError: while parsing /odoo/odoo14e/purchase/security/purchase_security.xml:39, near

<record id="base.default_user" model="res.users">

        <field name="groups_id" eval="[(4,ref('purchase.group_purchase_manager'))]"/>

    </record>