quick question: RE model relations

I'm creating an event module and want people to be able to associate a picture gallery with the event:

from django.utils.translation import get_language, ugettext, ugettext_lazy as _

from django.contrib import admin

from django.db import models

from django.contrib.auth.models import User

from tinymce import models as tinymce_models

from galleryview.models import Gallery

active_choices=(

        (1,"Yes"),

        (0,"No"),

)

class event (models.Model):

        id = models.AutoField (primary_key=True)

        active = models.IntegerField(blank=False, choices=active_choices)

        title = models.CharField(blank=False,max_length=150)

        startDate = models.DateTimeField (blank=False,db_index=True)

        endDate = models.DateTimeField (blank=False,db_index=True)

        blurb = models.TextField (blank=False, max_length=175,help_text="limit to a sentence, 175 chars.")

        message = models.TextField (blank=False, max_length=2000)

        GalleryId = models.ForeignKey('Gallery', verbose_name=_('Gallery Id'), related_name='Gallery_Id',blank=True, null=True, help_text=_("You can associate a photo gallery to this event here."))

class eventAdmin(admin.ModelAdmin):

        list_display = ('startDate','endDate','title','active',)

        list_filter = ('startDate',)

        date_heiarchy = ['startDate','endDate']

        search_fields = ['title','blurb','message']

admin.site.register(event,eventAdmin)

when i try to syncdb, i'm getting the following error:

Error: One or more models did not validate:

events.event: 'GalleryId' has a relation with model Gallery, which has either not been installed or is abstract.

What am i doing wrong here?

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