django - ValueError: "<MODEL MODELOBJECT>" needs to have a value for field "Mrefs" before this many-to-many relationship can be used -

i getting following error when trying add many many relationship. error happens when trying add many many field. same model no data many-many field loads fine.

traceback (most recent call last):   file "manage.py", line 10, in <module>     execute_from_command_line(sys.argv)   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line     utility.execute()   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute     self.fetch_command(subcommand).run_from_argv(self.argv)   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv     self.execute(*args, **options.__dict__)   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute     output = self.handle(*args, **options)   file "/home/app/pycharmprojects/app/management/commands/import_data_csv.py", line 101, in handle     manualref.manual_reference = manual.objects.get(mtype=mid)   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1188, in __set__     manager = self.__get__(instance)   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 1178, in __get__     through=self.field.rel.through,   file "/home/app/.virtualenvs/app/local/lib/python2.7/site-packages/django/db/models/fields/related.py", line 831, in __init__     (instance, source_field_name)) valueerror: "<model modelobject>" needs have value field "manual_reference" before many-to-many relationship can used 

my models:

from django.db import models

class manualrefs(models.model):     reference = models.textfield()     reference_type = models.charfield(max_length=10, blank=true)     manual_reference = models.manytomanyfield('manual', blank=true, null=true)  class manual(models.model):     info = models.foreignkey('tdictionary', blank=true, null=true)     mol = models.foreignkey('mdictionary', blank=false, null=false)     mtype = models.foreignkey('mtype', blank=true, null=true)       def __unicode__(self):          if self.mtype:             str = '-'             seq = (self.mtype.description, self.info.name, self.mol.mol)             return str.join(seq)         else:             return self.pk 

my code , here doing :

mid = mtype.objects.get(description =row[16])  manref = manualrefs() man = manual() refer in references:   types, reference = refer.split(':', 1)    manref.reference_type = types   manref.reference = reference   manref.manual_reference = manual.objects.get(mtype=mid)    manref.save()   man.save()   manref.manual.add(manref) 

what doing wrong?thanks

in order access manytomany field, object must saved database first. means can manref.manual_reference = manual.objects.get(mtype=mid) after manref.save().