Altered Django model. I provided a one-off default = datetime.date for DateField. Found that it's invalid. Removed the field and still can't migrate
<p>Hi here's the specific line that I added in models.py</p>

<p><code>billingMonth2 = models.DateTimeField()</code></p>

<p>This is what happened in makemigrations, I figured I added a non nullable field so I tried to define a default value:</p>

<pre><code>    You are trying to add a non-nullable field 'billingMonth' to bills 
    without a default; we can't do that (the database needs something to populate
    existing rows).
    Please select a fix:
    1) Provide a one-off default now (will be set on all existing rows)
    2) Quit, and let me add a default in models.py
    Select an option: 1
    Please enter the default value now, as valid Python
    The datetime and django.utils.timezone modules are available, so you can do 
    e.g. timezone.now()
    &gt;&gt;&gt; datetime.date
    Migrations for 'bills':
    0007_auto_20160609_1400.py:
    - Change Meta options on bills
    - Add field billingMonth to bills
</code></pre>

<p>I found out that datetime.date was invalid and came out with an error</p>

<pre><code>    ....File "/home/jrbenriquez/Envs/env1/local/lib/python2.7/site-packages/django/db/backends/base/schema.py", line 197, in effective_default
default = field.get_default()
    File "/home/jrbenriquez/Envs/env1/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py", line 797, in get_default
return self.default()
    TypeError: Required argument 'year' (pos 1) not found
</code></pre>

<p>So I just removed the billingMonth2 field hoping it would go back to normal and also setting a default value  as</p>

<pre><code>    `billingMonth2 = models.DateTimeField(default='Test',null=True,blank=True)`
</code></pre>

<p>Both still gives the same error. 
It seems to me I have changed something within the meta of the model in some other file or in the database and that I have to delete the default value "datetime.date" somewhere</p>

<p>I hope someone could help me here. Thanks!</p>

<p>UPDATE:
Here's 0007_auto20160609_1400.py</p>

<pre><code>    # -*- coding: utf-8 -*-
    # Generated by Django 1.9.6 on 2016-06-09 14:00
    from __future__ import unicode_literals

    from django.db import migrations, models
    import django.utils.datetime_safe


    class Migration(migrations.Migration): 

        dependencies = [
            ('bills', '0006_bills_duedate'),
        ]

        operations = [
            migrations.AlterModelOptions(
                name='bills',
                options={'ordering': ('-id', '-status'),     'verbose_name_plural': 'Bills'},
             ),
            migrations.AddField(
                model_name='bills',
                name='billingMonth',
                field=models.DateField(default=django.utils.datetime_safe.date),
                preserve_default=False,
             ),
]
</code></pre>