Error: One or more models did not validate: admin.logentry: 'user' has a relation with model , which has either not been installed or is abstract.

Hello every one 

I am new to Django - I am on Google Python App engine and try to work with Django to understand more about how Google App engine works. 

For that i follow the tutorial on   https://docs.djangoproject.com/en/1.4/intro/tutorial01/ I finist tutorial 01 and started with tutorial 02 the Admin part. 

First of all do i need this admin part to work with Django for a simple app? 

Second:

I get this message with:

$ python manage.py syncdb

Error: One or more models did not validate: admin.logentry: 'user' has a relation with model <class 'django.contrib.auth.models.User'>, which has either not been installed or is abstract. 

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