title: Errors when trying to create new project or create new app in existing project
body: <p>On my server is Django 1.9, several months ago i updated it from Django 1.8. And everything works fine until i decided to create new app in existing project:</p>
  
  <pre><code>python manage.py startapp test123
  </code></pre>
  
  <p>Then i got an error:</p>
  
  <p><code>/test123/tests.py already exists, overlaying a project or app into an existing directory won't replace conflicting files</code></p>
  
  <p>So I tried to do this on another projects and still the same. Then I tried to create new project and install new app on it, but when i type this command:</p>
  
  <pre><code>django-admin.py startproject anyproject
  </code></pre>
  
  <p>I got this error:
  <code>CommandError: /var/www/anyproject/manage.py already exists, overlaying a project or app into an existing directory won't replace conflicting files</code>
  Then i type this command in the root of existing project:</p>
  
  <pre><code>django-admin runserver
  </code></pre>
  
  <p>End got error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/bin/django-admin", line 5, in &lt;module&gt;
      from pkg_resources import load_entry_point
    File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2749, in &lt;module&gt;
      working_set = WorkingSet._build_master()
    File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 446, in _build_master
      return cls._build_from_requirements(__requires__)
    File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 459, in _build_from_requirements
      dists = ws.resolve(reqs, Environment())
    File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 628, in resolve
      raise DistributionNotFound(req)
  pkg_resources.DistributionNotFound: Django==1.8.3
  </code></pre>
  
  <p>Then this command:</p>
  
  <pre><code>django-admin.py runserver
  </code></pre>
  
  <p>Then there was this error:</p>
  
  <pre><code> File "/usr/local/bin/django-admin.py", line 5, in &lt;module&gt;
      management.execute_from_command_line()
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
      utility.execute()
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 345, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 195, in fetch_command
      klass = load_command_class(app_name, subcommand)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 39, in load_command_class
      module = import_module('%s.management.commands.%s' % (app_name, name))
    File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
      __import__(name)
    File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py", line 16, in &lt;module&gt;
      from django.db.migrations.executor import MigrationExecutor
    File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py", line 7, in &lt;module&gt;
      from .loader import MigrationLoader
    File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/loader.py", line 10, in &lt;module&gt;
      from django.db.migrations.recorder import MigrationRecorder
    File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/recorder.py", line 12, in &lt;module&gt;
      class MigrationRecorder(object):
    File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/recorder.py", line 26, in MigrationRecorder
      class Migration(models.Model):
    File "/usr/local/lib/python2.7/dist-packages/django/db/migrations/recorder.py", line 27, in Migration
      app = models.CharField(max_length=255)
    File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 1072, in __init__
      super(CharField, self).__init__(*args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/django/db/models/fields/__init__.py", line 166, in __init__
      self.db_tablespace = db_tablespace or settings.DEFAULT_INDEX_TABLESPACE
    File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line 55, in __getattr__
      self._setup(name)
    File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line 41, in _setup
      % (desc, ENVIRONMENT_VARIABLE))
  django.core.exceptions.ImproperlyConfigured: Requested setting DEFAULT_INDEX_TABLESPACE, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.
  </code></pre>
  
  <p>After that i uninstall all Django using pip, and then install again. But i still have this errors. Can anybody help me with it? Thanks</p>