Erro ao Registrar => 'email' is an invalid keyword argument for this function

olá não consigo entender o que está errado com o meu exemplo, alguém poderia me dar uma luz ?

TypeError at /registrar/
'email' is an invalid keyword argument for this function
Request Method:    POST
Request URL:    http://127.0.0.1:8000/registrar/
Django Version:    1.10.4
Exception Type:    TypeError
Exception Value:    
'email' is an invalid keyword argument for this function
Exception Location:    C:\Program Files (x86)\Python36-32\lib\site-packages\django\db\models\base.py in __init__, line 555
Python Executable:    C:\Program Files (x86)\Python36-32\python.exe
Python Version:    3.6.0
Python Path:    
['C:\\connectedin',
 'C:\\Program Files (x86)\\Python36-32\\python36.zip',
 'C:\\Program Files (x86)\\Python36-32\\DLLs',
 'C:\\Program Files (x86)\\Python36-32\\lib',
 'C:\\Program Files (x86)\\Python36-32',
 'C:\\Program Files (x86)\\Python36-32\\lib\\site-packages']
Server time:    Ter, 3 Jan 2017 17:46:26 -0200