- field=catalogue.fields.EbookField(b'cover_api_thumb', max_length=255, upload_to=catalogue.models.book.UploadToPath(b'book/cover_api_thumb/%s.jpg'), null=True, verbose_name='cover thumbnail for mobile app', blank=True),
+ field=catalogue.fields.EbookField('cover_api_thumb', max_length=255, upload_to=catalogue.models.book.UploadToPath('book/cover_api_thumb/%s.jpg'), null=True, verbose_name='cover thumbnail for mobile app', blank=True),