Django collectstatic no such file or directory

In django 1.7 collectstatic throws an exception for me:

OSError: [Errno 2] No such file or directory: '/static'

I've performed a lot of collectstatic-calls and everything worked fine, but today have this issue.

settings.py

BASE_DIR = os.path.dirname(os.path.realpath(__file__))
INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'fxblog',
    'rest_framework',
)

STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, STATIC_URL.strip("/"))

STATICFILES_DIRS = (
    '/static/',
    '/upload/',
)

BASE_DIR is correct, checked it. Directory BASE_DIR/static/ exists and all my static files are there.

Traceback:

Traceback (most recent call last):
  File "../manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 173, in handle_noargs
    collected = self.collect()
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 103, in collect
    for path, storage in finder.list(self.ignore_patterns):
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/staticfiles/finders.py", line 106, in list
    for path in utils.get_files(storage, ignore_patterns):
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/staticfiles/utils.py", line 25, in get_files
    directories, files = storage.listdir(location)
  File "/usr/local/lib/python2.7/dist-packages/django/core/files/storage.py", line 249, in listdir
    for entry in os.listdir(path):
OSError: [Errno 2] No such file or directory: '/static'

Any suggestions?

Files in STATICFILES_DIRS need to have absolute path. Use normpath.

STATICFILES_DIRS = (
    normpath(join(BASE_DIR, 'static')),
    normpath(join(BASE_DIR, 'upload')),
)

Also it is good to set STATIC_ROOT to something like

STATIC_ROOT = normpath(join(BASE_DIR, 'assets'))

and STATIC_URL

STATIC_URL = '/static/'