python - Django ORM Array Field Error -

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i got error when trying run migrate command

file "/usr/local/lib/python3.4/dist-packages/django/db/backends/utils.py", line 64, in execute return self.cursor.execute(sql, params) psycopg2.programmingerror: operator class "varchar_pattern_ops" not accept data type character varying[]

i have arrayfield in model. when removed arrayfield, worked fine

i'm using django 1.8, python 3.4 , postgresql 9.4

models

from django.db import models django.contrib.postgres.fields import arrayfield django.contrib.auth.models import user   class post(models.model):      author = models.foreignkey(user)     title = models.charfield(max_length=512)     slug = models.slugfield(unique=true, db_index=true)     summary = models.textfield(blank=true, null=true)     content = models.textfield()     tags = arrayfield(models.charfield(max_length=256), blank=true, db_index=true)     is_published = models.booleanfield(default=true)     has_comments = models.booleanfield(default=true)     created_on = models.datetimefield(auto_now_add=true)     updated_on = models.datetimefield(auto_now=true)      def __str__(self):         return self.title   class comment(models.model):      post = models.foreignkey(post, db_index=true)     name = models.charfield(max_length=256)     email = models.emailfield()     content = models.textfield()     is_published = models.booleanfield(default=false)     created_on = models.datetimefield(auto_now_add=true)     updated_on = models.datetimefield(auto_now=true)      def __str__(self):         return self.name

migrations

from __future__ import unicode_literals  django.db import models, migrations import django.contrib.postgres.fields django.conf import settings   class migration(migrations.migration):      dependencies = [         migrations.swappable_dependency(settings.auth_user_model),     ]      operations = [         migrations.createmodel(             name='comment',             fields=[                 ('id', models.autofield(verbose_name='id', serialize=false, auto_created=true, primary_key=true)),                 ('name', models.charfield(max_length=256)),                 ('email', models.emailfield(max_length=254)),                 ('content', models.textfield()),                 ('is_published', models.booleanfield(default=false)),                 ('created_on', models.datetimefield(auto_now_add=true)),                 ('updated_on', models.datetimefield(auto_now=true)),             ],         ),         migrations.createmodel(             name='post',             fields=[                 ('id', models.autofield(verbose_name='id', serialize=false, auto_created=true, primary_key=true)),                 ('title', models.charfield(max_length=512)),                 ('slug', models.slugfield(unique=true)),                 ('summary', models.textfield(null=true, blank=true)),                 ('content', models.textfield()),                 ('tags', django.contrib.postgres.fields.arrayfield(blank=true, size=none, base_field=models.charfield(max_length=256), db_index=true)),                 ('is_published', models.booleanfield(default=true)),                 ('has_comments', models.booleanfield(default=true)),                 ('created_on', models.datetimefield(auto_now_add=true)),                 ('updated_on', models.datetimefield(auto_now=true)),                 ('author', models.foreignkey(to=settings.auth_user_model)),             ],         ),         migrations.addfield(             model_name='comment',             name='post',             field=models.foreignkey(to='posts.post'),         ),     ]


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