RewriteBase takes one argument, the base URL of the per-directory context

I'm hosting a omeka-2.1.4 on xampp, and after defining db.ini and everything else mentioned in the instalation tutorial I keep getting "Error 500" and the Apache error.log is giving out "[Wed Mar 05 13:30:42.532414 2014] [core:alert] [pid 4468:tid 1808] [client ::1:49532] C:/xampp/htdocs/omeka/.htaccess: RewriteBase takes one argument, the base URL of the per-directory context".

Any idea what could be causing this error?

Looks like you may have some kind of syntax error in your .htaccess file.

What's it look like, particularly the RewriteBase line?

# Omeka .htaccess: Apache configuration file
# This file is required for Omeka to function correctly.

# --------------- #
# Error Reporting #
# --------------- #

# Uncomment the SetEnv line below to turn on detailed on-screen error
# reporting.
#
# Note: This should only be enabled for development or debugging. Keep this
# line commented for production sites.
#
# SetEnv APPLICATION_ENV development

# ------------- #
# Rewrite Rules #
# ------------- #

RewriteEngine on

# If you know mod_rewrite is enabled, but you are still getting mod_rewrite
# errors, uncomment the line below and replace "/" with your base directory.
#C:\xampp\htdocs\omeka-2.1.1 is the root of the #folder
RewriteBase omeka-2.1.1
#

# Allow direct access to files (except PHP files)
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule !\.php$ - [C]
RewriteRule .* - [L]

RewriteRule ^install/.*$ install/install.php [L]
RewriteRule ^admin/.*$ admin/index.php [L]
RewriteRule .* index.php

# -------------- #
# Access Control #
# -------------- #

# Block access to all .ini files.
<FilesMatch "\.ini$">
Order Allow,Deny
Deny from all
</FilesMatch>

# --------#
# Caching #
# --------#

# Uncomment the lines below in order to enable caching of some files
# (after a finished site has gone live)
#
# <IfModule mod_expires.c>
# <FilesMatch "\.(js|ico|gif|jpg|png|css)$">
# ExpiresActive on
# ExpiresDefault "access plus 10 day"
# </FilesMatch>
# </IfModule>

# ------------ #
# PHP Settings #
# ------------ #

<IfModule mod_php5.c>
php_flag register_globals off
php_flag magic_quotes_gpc off
</IfModule>

After I comment RewriteBase omeka-2.1.1 I get

"Installation Error

mod_rewrite is not enabled.

Apache's mod_rewrite extension must be enabled for Omeka to work properly. Please enable mod_rewrite and try again. "

And I've tried to do this
http://www.leonardaustin.com/blog/technical/enable-mod_rewrite-in-xampp/

This sounds really close to the problem I'm having with my installation, any update on this? I did already edit by httpd file to AllowOverride All and LoadModule rewrite_module modules/mod_rewrite.so is uncommented