updating model breaks admin

Hi all,

I want to request your help and I am sure you can guess by the question that I am fairly new to Django and THANK YOU IN ADVANCE, I would like to, someday, publish this portfolio website. I am sure I am making such a rookie mistake and will have to kick myself for making such a silly error but I am stuck !! Hope to pay it forward.

I have this model in the articles app that works great: 

class Article(models.Model):

    title = models.CharField(max_length=120, unique=True)

    body=models.TextField(max_length=600)

    date=models.DateField()

    created = models.DateField(auto_now_add=True)

    featured=models.BooleanField(default=False)

    slug = models.SlugField(blank=True)

UNTIL I add a new class and add this field:

    tags = models.ManyToManyField(Tag)

Error message when adding a new article in admin:

OperationalError at /admin/articles/article/add/

cursor "_django_curs_5508_1" does not exist

Error message when adding a new tag in admin:

ProgrammingError at /admin/articles/tag/add/

relation "articles_tag" does not exist  LINE 1: SELECT (1) AS "a" FROM "articles_tag" WHERE "articles_tag"."..

What I have tried to no avail:

1) deleting all articles

2) migrate & makemigrations 

3) deleting any references to tags in my templates

4) searching these errors on stackoverflow

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