ImportError: No module named site

I searched this group for that error, and browsed through several
pages and dozens of posts...but none of them helped me solve my error.

Yesterday I had my server up and running, and I left it running
overnight. I do not remember changing anything in any of my .py files,
but when I shut down my server to restart it, I was getting an error:

"Import Error: No module named site"

I have no idea what is going wrong, but here is all my code thus far
(I'm following the tutorial to create my own app that will display
various material measurements)

-----------------------------------------------
models.py
-----------------------------------------------
from django.db import models

# Create your models here.
class adhesive(models.Model):
measurement_id = models.CharField(max_length = 200)
material_id = models.CharField(max_length = 200)
program_name = models.CharField(max_length = 200)
date = models.DateField()
measurement_method = models.CharField(max_length = 30)
frequency_low = models.IntegerField()
frequency_high = models.IntegerField()

class ceramic(models.Model):
measurement_id = models.CharField(max_length = 200)
material_id = models.CharField(max_length = 200)
program_name = models.CharField(max_length = 200)
date = models.DateField()
measurement_method = models.CharField(max_length = 30)
frequency_low = models.IntegerField()
frequency_high = models.IntegerField()

class composite(models.Model):
measurement_id = models.CharField(max_length = 200)
material_id = models.CharField(max_length = 200)
program_name = models.CharField(max_length = 200)
date = models.DateField()
measurement_method = models.CharField(max_length = 30)
frequency_low = models.IntegerField()
frequency_high = models.IntegerField()

---------------------------------------------------
settings.py
---------------------------------------------------
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql', # Add
'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
'NAME': 'materials', # Or path to
database file if using sqlite3.
'USER': 'root', # Not used with sqlite3.
'PASSWORD': 'xxxxx', # Not used with sqlite3.
'HOST': '', # Set to empty string for
localhost. Not used with sqlite3.
'PORT': '', # Set to empty string for
default. Not used with sqlite3.
}
}

...

ROOT_URLCONF = 'material_measurements/urls'

TEMPLATE_DIRS = (
# Put strings here, like "/home/html/django_templates" or "C:/www/
django/templates".
# Always use forward slashes, even on Windows.
# Don't forget to use absolute paths, not relative paths.
"C:/Django/material_measurements.materials"
)

INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'material_measurements.materials',
# 'django.contrib.messages',
# 'django.contrib.staticfiles',
# Uncomment the next line to enable the admin:
'django.contrib.admin',
# Uncomment the next line to enable admin documentation:
# 'django.contrib.admindocs',
)

---------------------------------------
urls.py
---------------------------------------
from django.conf.urls.defaults import *

# Uncomment the next two lines to enable the admin:
from django.contrib import admin
admin.autodiscover()

urlpatterns = patterns('',
# Examples:
# url(r'^$', 'material_measurements.views.home', name='home'),
# url(r'^material_measurements/',
include('material_measurements.foo.urls')),

# Uncomment the admin/doc line below to enable admin
documentation:
# url(r'^admin/doc/', include('django.contrib.admindocs.urls')),

# Uncomment the next line to enable the admin:
(r'^admin/(.*)', admin.site.root),
)

Thanks for the help!

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