Applying auth. 0008 _alter_user_username_max_length... Traceback (the most recent call last) :
The File "is the manage. Py", line 22, in & lt; module>
Execute_from_command_line (sys. Argv)
.
Django. Db. Utils. OperationalError: & lt; The exception STR () failed>

Perform data migration error in the shell, database connection should be no problem, some has entered into a database table, separate application execution self-built database migration model can show normal inserted into the database, should be the migration Settings. Py INSTALLED_APPS bring in some of the applications of the error,