django.core.exceptions.FieldError: Cannot resolve keyword 'ModelList' into field. Choices are: borrows, dept_list, dept_list_id, email_ads is

1. question

i am a beginner of Djanog, i am experiencing a problem of django.core.exceptions.FieldError: Cannot resolve keyword 'ModelList' into field. Choices are: borrows, dept_list, dept_list_id,.....

sometime it shows django.core.exceptions.FieldError: Cannot resolve keyword 'PcStatus_id' into field

1. i have try to remove the files on migrations folder excuted python manage.py makemigrations and migrate ,and reload nginx, restart uwsgi,

2. issue will appear again after the server run normally for a moment. the issue is not heppen immediately after the server up, also ,

3. i have try to rename the field name, but this is not helpful for solving the issue. could you please help chech where is wrong, where does the issue come from ?

   '''python

model.py

 class pc_list(models.Model):
        host_name=models.CharField(max_length=64, unique=True)
        service_tag=models.CharField(max_length=45,unique=True)
        #hosttype_list=models.ForeignKey('hosttype_list', to_field='id',default=1, on_delete=None)
        ModelList=models.ForeignKey('ModelList',to_field='id',on_delete=None)
        host_spec=models.CharField(max_length=45)
        price=models.FloatField(default=0)
        receive_date=models.DateField(auto_now_add =False, default='2018-01-01')
        user_list = models.ForeignKey('user_list', to_field='id',  on_delete=None, default=180)
        seat_no = models.IntegerField(default=14000)
        PcStatus=models.ForeignKey('PcStatus', to_field='id',  on_delete=None, default=2)
        studio = models.CharField(max_length=45, default='-')
        site_list=models.ForeignKey('site_list', to_field='id', on_delete=None)
        asset_code = models.IntegerField(default=1)
        remark=models.TextField(max_length=200, default='-')
        mac=models.CharField(max_length=15, default='-')
        class Meta:
            ordering = ('host_name',)

        def __str__(self):
            return self.host_name


    class PcStatus(models.Model):
        statusname=models.CharField(max_length=45,default='--')
        def __str__(self):
            return self.statusname

    class ModelList(models.Model):
        name = models.CharField(max_length=40)
        hosttype_list = models.ForeignKey('hosttype_list',to_field='id',on_delete=False)

        def __str__(self):
            return self.name
        class Meta:
            ordering = ('name',)

    **view as below**

    class pcDataView(FeedDataView):

        token = pc_listTable.token

        def get_queryset(self):
            siteid = self.request.session.get('current_site')
            hosttypeid=self.request.session.get('hosttype_id')
            if hosttypeid ==0:
                return super(pcDataView, self).get_queryset().filter(site_list_id=siteid , ModelList__hosttype_list_id__in=(1,2,3,12)).exclude(PcStatus_id=4)
            else:
                return super(pcDataView, self).get_queryset().exclude(PcStatus_id=4).filter(Q(site_list_id=siteid)&Q(ModelList__hosttype_list_id=hosttypeid))

'''