Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangocoremanagement__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangocoremanagement__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangocoremanagementbase.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangocoremanagementbase.py", line 353, in execute
    output = self.handle(*args, **options)
  File "C:PROJECTSleadshubtender_matching_enginemanagementcommandsscrap_etenders.py", line 8, in handle
    main()
  File "C:PROJECTSleadshubTender_Loaderetenders_scraper.py", line 52, in main
    save_tender_to_db(entry)
  File "C:PROJECTSleadshubTender_Loaderetenders_scraper.py", line 129, in save_tender_to_db
    description=container_tag[0]
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsmanager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsquery.py", line 413, in create
    obj.save(force_insert=True, using=self.db)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsbase.py", line 718, in save
    force_update=force_update, update_fields=update_fields)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsbase.py", line 748, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsbase.py", line 831, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsbase.py", line 869, in _do_insert
    using=using, raw=raw)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsmanager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelsquery.py", line 1136, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelssqlcompiler.py", line 1288, in execute_sql
    for sql, params in self.as_sql():
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelssqlcompiler.py", line 1241, in as_sql
    for obj in self.query.objs
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelssqlcompiler.py", line 1241, in <listcomp>
    for obj in self.query.objs
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelssqlcompiler.py", line 1240, in <listcomp>
    [self.prepare_value(field, self.pre_save_val(field, obj)) for field in fields]
  File "C:UsersACERAppDataLocalProgramsPythonPython36libsite-packagesdjangodbmodelssqlcompiler.py", line 1168, in prepare_value
    value = value.resolve_expression(self.query, allow_joins=False, for_save=True)
TypeError: 'NoneType' object is not callable

#This is the model that stores the tender.
class Tender(models.Model):
    tenderCategory = models.ManyToManyField(Category, blank=False)       #this field holds the tender category, e.g. construction, engineering, human resources etc.
    tenderProvince = models.ManyToManyField(Province, blank=False)       #this is the province the tender was advertised from.
    buyersName = models.CharField(max_length=100)   #this is the name of the Buyer e.g. Dept. of Transport, Transnet, Dept of Agriculture etc.
    summary = models.TextField(blank=False)      #this is the tender title as per the Buyer.
    refNum = models.CharField(max_length=100)    #tender ref number as per the Buyer.
    issueDate = models.DateTimeField(blank=True, null=True)     #date the tender was published
    closingDate = models.DateTimeField(default=timezone.now, blank=True, null=True)   #tender closing date
    siteInspectionDate = models.DateTimeField(blank=True, null=True)
    siteInspection = RichTextField(blank=True, null=True)     #site inspection date, if any
    enquiries = RichTextField(blank=True, null=True) #this field stores details of the contact person, for the tender.
    description = RichTextField(blank=True, null=True)   #this is the body of the tender. the tender details are captured here.
    assigned_keywords = models.ManyToManyField(Keywords, blank=True)
    matched = models.BooleanField(default=False, blank=False)
    capture_date = models.DateField(default=timezone.now, blank=False, null=False)
    date_assigned = models.DateField(blank=True, null=True)
    tDocLinks = RichTextField(blank=True)

    def check_if_expired(self):
        if self.closingDate < timezone.now():
            return True
        else:
            return False

    class Meta:
        ordering = ['-closingDate']

# tenderCategory=Category.objects.get(pk=1),
 # tenderProvince=Province.objects.get(pk=1),