1054 Unknown column content_type_id in field list django 1.7b1

[maxwell]

Hi.

I'm using django 1.7b1. And I made generic relation in my models:

class Transaction(models.Model):

    ...

    # Generic foreign key

    content_type = models.ForeignKey(ContentType)

    object_id = models.PositiveIntegerField()

    content_object = GenericForeignKey('content_type', 'object_id')

class Document(models.Model): 

... 

transactions = GenericRelation(Transaction)

and admin.py:

 class TransactionInline(GenericTabularInline):

    model = Transaction

    formfield_overrides = {

        models.TextField: {'widget': forms.Textarea(attrs={'cols': 40,

                                                           'rows': 2})}

    }

@admin.register(Document)

class DocumentAdmin(admin.ModelAdmin):

   ...

    inlines = [

        TransactionInline,

    ] 

Can you suggest where the problem may be? I have some similar fields in my old project (django 1.6) and all works fine.

 

[maxwell]

The error occurs on record save in django admin.