python - integrating Django 1.11 with a legacy database -

i'm trying read data legacy database django 1.11. used inspectdb save database model app directory. anytime try open django shell or runserver error

valueerror: source code string cannot contain null bytes

can me solve error read data database?

my models:

# auto-generated django model module. # you'll have following manually clean up: #   * rearrange models' order #   * make sure each model has 1 field primary_key=true #   * make sure each foreignkey has `on_delete` set desired behavior. #   * remove `managed = false` lines if wish allow django create, modify, , delete table # feel free rename models, don't rename db_table values or field names. __future__ import unicode_literals  django.db import models    class justaccount(models.model):             id = models.integerfield(primary_key=true)  # autofield?       account_name = models.charfield(db_column='account_name', max_length=100) # field name made lowercase.       account_number = models.integerfield(db_column='account_number')  # field name made lowercase.       ammount = models.floatfield(db_column='ammount')  # field name made lowercase.    class meta:     managed = false     db_table = 'just_account'