- field=catalogue.fields.EbookField('cover_clean', blank=True, max_length=255, null=True, upload_to=catalogue.fields.UploadToPath('book/cover_clean/%s.jpg'), verbose_name='clean cover'),
+ field=models.FileField(blank=True, max_length=255, null=True, upload_to=catalogue.fields.UploadToPath('book/cover_clean/%s.jpg'), verbose_name='clean cover'),