поменял путь к картинкам

taskapp/migrations/0013_auto_20170413_1944.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2017-04-13 16:44
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('taskapp', '0012_auto_20170407_0124'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='task',
+            name='attachment',
+            field=models.ImageField(blank=True, null=True, upload_to='task_attachments/%Y.%m.%d'),
+        ),
+    ]