Hello, I was updating access rights of security.csv file of a module. 
But, after updating while I try to upgrade the module it gives the below error. 
I tried removing what I wrote, but still same.

Traceback (most recent call last):
  File "C:\Users\User\odoo15\server\odoo\addons\base\models\ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "C:\Users\User\odoo15\server\odoo\http.py", line 687, in dispatch
    result = self._call_function(**self.params)
  File "C:\Users\User\odoo15\server\odoo\http.py", line 359, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Users\User\odoo15\server\odoo\service\model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Users\User\odoo15\server\odoo\http.py", line 348, in checked_call
    result = self.endpoint(*a, **kw)
  File "C:\Users\User\odoo15\server\odoo\http.py", line 916, in __call__
    return self.method(*args, **kw)
  File "C:\Users\User\odoo15\server\odoo\http.py", line 535, in response_wrap
    response = f(*args, **kw)
  File "C:\Users\User\odoo15\server\odoo\addons\web\controllers\main.py", line 1347, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "C:\Users\User\odoo15\server\odoo\addons\web\controllers\main.py", line 1335, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "C:\Users\User\odoo15\server\odoo\api.py", line 464, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "C:\Users\User\odoo15\server\odoo\api.py", line 451, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "", line 2, in button_immediate_upgrade
  File "C:\Users\User\odoo15\server\odoo\addons\base\models\ir_module.py", line 74, in check_and_log
    return method(self, *args, **kwargs)
  File "C:\Users\User\odoo15\server\odoo\addons\base\models\ir_module.py", line 662, in button_immediate_upgrade
    return self._button_immediate_function(type(self).button_upgrade)
  File "C:\Users\User\odoo15\server\odoo\addons\base\models\ir_module.py", line 600, in _button_immediate_function
    registry = modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "C:\Users\User\odoo15\server\odoo\modules\registry.py", line 87, in new
    odoo.modules.load_modules(registry, force_demo, status, update_module)
  File "C:\Users\User\odoo15\server\odoo\modules\loading.py", line 472, in load_modules
    force, status, report, loaded_modules, update_module, models_to_check)
  File "C:\Users\User\odoo15\server\odoo\modules\loading.py", line 365, in load_marked_modules
    perform_checks=perform_checks, models_to_check=models_to_check
  File "C:\Users\User\odoo15\server\odoo\modules\loading.py", line 222, in load_module_graph
    load_data(cr, idref, mode, kind='data', package=package)
  File "C:\Users\User\odoo15\server\odoo\modules\loading.py", line 69, in load_data
    tools.convert_file(cr, package.name, filename, idref, mode, noupdate, kind)
  File "C:\Users\User\odoo15\server\odoo\tools\convert.py", line 745, in convert_file
    convert_xml_import(cr, module, fp, idref, mode, noupdate)
  File "C:\Users\User\odoo15\server\odoo\tools\convert.py", line 794, in convert_xml_import
    relaxng.assert_(doc)
  File "src\lxml\etree.pyx", line 3633, in lxml.etree._Validator.assert_
Exception

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

Traceback (most recent call last):
  File "C:\Users\User\odoo15\server\odoo\http.py", line 643, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "C:\Users\User\odoo15\server\odoo\http.py", line 301, in _handle_exception
    raise exception.with_traceback(None) from new_cause
AssertionError: Element odoo has extra content: menuitem, line 9