Admin: Unknown fields

Hello,

I am new to Python and Django so please bear with me.

I have  created a model(below) and would now like to access 

from the admin interface. As per instructions  I found on the 

django site (Part 2 tutorial version 1.8.4) 

model

///////////////////////////////////////////////////////////////////////////////////////////////////////

class Genus(models.Model):

genus_id = models.AutoField(primary_key=True),

scientific_genus = models.CharField(max_length=32),

common_name = models.CharField(max_length=32),

common_examples = models.TextField(),

genus_choices = (

('Member Banana...','Musa'),

('Mango...','Magnifera'),

('Avocado...','Persea Americana'),

('Soursop, Custard, Sugar Apple...','Annona Reticulata'),

('Ginger, Tumeric ...','Zingiber Officinale Roscoe'),

('Persimmon....','Diospyros'),

('Breadfruit...','Artocarpus Altilis'),

('Cherry ...','Prunus'),

('Grapes ...','Vitis'), 

('Tomato ...','Lycopersicon'), 

('EggPlant ...','????????'), 

('Onion, Garlic ...','Allium'),

('Cashew ...','Anacardium'),

('Rice ...','Oryza'),

('Pepper ...','Capsicum'),

('Orange,Lemon, Lime ....','Citrus')

),

image_url = models.CharField(max_length=128),

genus = models.CharField(max_length=32,choices=genus_choices),

description = models.TextField()

I edit  "admin.py"  so that it now looks like

admin.py

//////////////////////////////////////////////////////////////////////////////////////////////////

from django.contrib import admin

from cfxBase.models import Genus

# Register your models here.

class GenusAdmin(admin.ModelAdmin):

    fields = [

               'genus',

               'scientific_genus',

               'common_name',

               'description',

               'common_examples',

               'image_url'

    ]

    

admin.site.register(Genus, GenusAdmin)

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Now when I attempt the admin page add entry  for Genus I am getting this 

error:

FieldError at /admin/cfxBase/genus/add/

Unknown field(s) (scientific_genus, genus, common_name, common_examples, 

                  description, image_url) specified for Genus. 

Check fields/fieldsets/exclude attributes of class GenusAdmi

Your help will be  greatly appreciated

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