Clean URL problem

According to the handbook of setting Clear URL

it says to put "AllowOverride All" in .htaccess.

However, I got "500 server internal error".

 

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Mistake:

Note: If you have Drupal in a subdirectory (not your webroot), you need to uncomment the rewritebase option in your .htaccess file (the one provided with Drupal).

# Modify the RewriteBase if you are using Drupal in a subdirectory or in a
  # VirtualDocumentRoot and the rewrite rules are not working properly.
  # For example if your site is at http://example.com/drupal uncomment and
  # modify the following line:
  # RewriteBase /drupal

I found that "AllowOverride All" is the default value. My web site mainly has problem because I use SUBDOMAIN. After I change to the orginal location in URL, there is no problem to use clearn URL.

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The Subdomain module currently only supports 5.x. So I tried to install more powerful module: Domain Access.