Python Django admin and xadmin background error problems-CodePudding

Before the background properly registered module to the background, for a long time didn't go to the login background, now use xadmin now start server error:

Django. Core. Exceptions. ImproperlyConfigured: Put 'django. Contrib. Contenttypes' in your INSTALLED_APPS setting in order to use the admin application.
But setting. Py in existing django. Contrib. Contenttypes

 INSTALLED_APPS=[
'the django. Contrib. Admin, 
'the django. Contrib. Auth', 
'the django. Contrib. Contenttypes', 
'the django. Contrib. Sessions', 
'the django. Contrib. Messages', 
'the django. Contrib. Staticfiles', 
'xadmin' 
'crispy_forms'

This is my admin. Py the code in the

 from the django. Contrib import admin 
# Register your models here. 
The import xadmin 

From the models import Profile 

Xadmin. Site. Register (Profile. Objects)

There is an error in front of an error

 Traceback (the most recent call last) : 
The File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ threading py", line 916, in _bootstrap_inner 
The self. The run () 
The File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ threading py", line 864, in the run 
Self. _target (, * * * self. _args self. _kwargs) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ autoreload py", line 54, wrapper in 
Fn (* args, * * kwargs) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django/core/management/commands \ runserver then executes py", line 109, in inner_run 
Autoreload. Raise_last_exception () 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ autoreload py", line 77, in raise_last_exception 
Raise _exception [0] (_exception [1]). With_traceback (_exception [2]) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ autoreload py", line 54, wrapper in 
Fn (* args, * * kwargs) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ set py", line 24, setup in 
Apps. The populate (Settings. The INSTALLED_APPS) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ apps \ registry py", line 122, in the populate 
App_config. Ready () 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ contrib \ admin \ apps py", 24, line ready in 
The self. The module. Autodiscover () 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ contrib \ admin \ set py", 26, the line in autodiscover 
Autodiscover_modules (' admin 'register_to=site) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ module_loading py", line 47, in autodiscover_modules 
Import_module (' % s. % s' % (app_config. Name, module_to_search)) 
The File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ importlib \ set py", line 126, in import_module 
Return _bootstrap. _gcd_import (name [level:], package, level) 
The File "& lt; Frozen importlib. _bootstrap & gt;" , line 994, in _gcd_import 
The File "& lt; Frozen importlib. _bootstrap & gt;" , line 971, in _find_and_load 
The File "& lt; Frozen importlib. _bootstrap & gt;" , line 955, in _find_and_load_unlocked 
The File "& lt; Frozen importlib. _bootstrap & gt;" , line 665, in _load_unlocked 
The File "& lt; Frozen importlib. _bootstrap_external & gt;" , line 678, in exec_module 
The File "& lt; Frozen importlib. _bootstrap & gt;" , line 219, in _call_with_frames_removed 
The File "C: \ Users \ CRXB \ PycharmProjects \ djangoProject4 \ rb \ admin py", line 8, the in & lt; module> 
Xadmin. Site. Register (Profile. Objects) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ xadmin \ sites py", line 97, in the register 
If isinstance (model_or_iterable, ModelBase) or issubclass (model_or_iterable, BaseAdminView) : 
TypeError: issubclass (arg) 1 must be a class

Use native admin will prompt an error

 Traceback (the most recent call last) : 
The File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ threading py", line 916, in _bootstrap_inner 
The self. The run () 
The File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ threading py", line 864, in the run 
Self. _target (, * * * self. _args self. _kwargs) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ autoreload py", line 54, wrapper in 
Fn (* args, * * kwargs) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django/core/management/commands \ runserver then executes py", line 109, in inner_run 
Autoreload. Raise_last_exception () 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ autoreload py", line 77, in raise_last_exception 
Raise _exception [0] (_exception [1]). With_traceback (_exception [2]) 
File "C: \ Users \ CRXB \ AppData \ Local \ designed \ Python \ Python36-32 \ lib \ site - packages \ django \ utils \ autoreload py", line 54, wrapper in 
Fn (* args, * * kwargs) 
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