Where should I set this? 
I do not use JSON in the application.
When you start the application, the error appears below:

intranet | Watching for file changes with StatReloader
intranet | Exception in thread django-main-thread:
intranet | Traceback (most recent call last):
intranet |   File "/usr/local/lib/python3.7/threading.py", line 926, in 
_bootstrap_inner
intranet |     self.run()
intranet |   File "/usr/local/lib/python3.7/threading.py", line 870, in run
intranet |     self._target(*self._args, **self._kwargs)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 
53, in wrapper
intranet |     fn(*args, **kwargs)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/core/management/commands/runserver.py",
 
line 110, in inner_run
intranet |     autoreload.raise_last_exception()
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 
76, in raise_last_exception
intranet |     raise _exception[1]
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/core/management/__init__.py", 
line 357, in execute
intranet |     autoreload.check_errors(django.setup)()
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/utils/autoreload.py", line 
53, in wrapper
intranet |     fn(*args, **kwargs)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/__init__.py", line 24, in 
setup
intranet |     apps.populate(settings.INSTALLED_APPS)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/apps/registry.py", line 114, 
in populate
intranet |     app_config.import_models()
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/apps/config.py", line 211, 
in import_models
intranet |     self.models_module = import_module(models_module_name)
intranet |   File "/usr/local/lib/python3.7/importlib/__init__.py", line 
127, in import_module
intranet |     return _bootstrap._gcd_import(name[level:], package, level)
intranet |   File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
intranet |   File "<frozen importlib._bootstrap>", line 983, in 
_find_and_load
intranet |   File "<frozen importlib._bootstrap>", line 967, in 
_find_and_load_unlocked
intranet |   File "<frozen importlib._bootstrap>", line 677, in 
_load_unlocked
intranet |   File "<frozen importlib._bootstrap_external>", line 728, in 
exec_module
intranet |   File "<frozen importlib._bootstrap>", line 219, in 
_call_with_frames_removed
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/contrib/auth/models.py", 
line 2, in <module>
intranet |     from django.contrib.auth.base_user import AbstractBaseUser, 
BaseUserManager
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/contrib/auth/base_user.py", 
line 48, in <module>
intranet |     class AbstractBaseUser(models.Model):
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 
122, in __new__
intranet |     new_class.add_to_class('_meta', Options(meta, app_label))
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/models/base.py", line 
326, in add_to_class
intranet |     value.contribute_to_class(cls, name)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/models/options.py", line 
206, in contribute_to_class
intranet |     self.db_table = truncate_name(self.db_table, 
connection.ops.max_name_length())
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/__init__.py", line 28, in 
__getattr__
intranet |     return getattr(connections[DEFAULT_DB_ALIAS], item)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/utils.py", line 214, in 
__getitem__
intranet |     backend = load_backend(db['ENGINE'])
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/utils.py", line 111, in 
load_backend
intranet |     return import_module('%s.base' % backend_name)
intranet |   File "/usr/local/lib/python3.7/importlib/__init__.py", line 
127, in import_module
intranet |     return _bootstrap._gcd_import(name[level:], package, level)
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/base.py", 
line 29, in <module>
intranet |     from .introspection import DatabaseIntrospection            
# isort:skip
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/introspection.py",
 
line 16, in <module>
intranet |     class DatabaseIntrospection(BaseDatabaseIntrospection):
intranet |   File 
"/usr/local/lib/python3.7/site-packages/django/db/backends/mysql/introspection.py",
 
line 27, in DatabaseIntrospection
intranet |     FIELD_TYPE.JSON: 'JSONField',
intranet | AttributeError: module 'MySQLdb.constants.FIELD_TYPE' has no 
attribute 'JSON'

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