Using the django.contrib.auth User in my model - database error

Part of my application that uses the contrib,auth User 

from django.db import models

from django.contrib.auth.models import User

class Project(models.Model):

name = models.CharField(max_length=200)

startdate = models.DateField('Project Started')

enddate = models.DateField('Expected end date')

manager = models.ForeignKey(User,related_name="Expert")

users = models.ManyToManyField(User,related_name='project_users')

Then defined in admin.py

from coordination.models import *

from django.contrib import admin

from django.contrib.auth.models import User

class ProjectAdmin(admin.ModelAdmin):

fieldsets = [

(None, {'fields': ['name']}),

('People', {'fields': ['users'], 'classes' :['collapse']}),

('Date information', {'fields': ['startdate','enddate'] , 'classes' : ['collapse']}),]

admin.site.register(Project, ProjectAdmin)

I ran syncdb without a problem ,  then when I used the admin interface I get the following error :

Exception Type: DatabaseError at /admin/coordination/project/

Exception Value: no such column: coordination_project.manager_id

Kind regards , Jonathan

Request Method:	GET
Request URL:	http://localhost:8000/admin/coordination/project/
Django Version:	1.4
Exception Type:	DatabaseError
Exception Value:	no such column: coordination_project.manager_id
Exception Location:	C:\Tools\Python2.7.2\lib\site-packages\django\db\backends\sqlite3\base.py in execute, line 337
Python Executable:	C:\Tools\Python2.7.2\python.exe
Python Version:	2.7.2

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