Google bot crawl 404 errors

Kinda looks like you have WP installed in /blog and are doing some sort of rewrite already.

thanks for the reply webjunk.

my files are in public_html. there is no blog folder only:
– cgi-bin
– wp-admin
– wp-content
– wp-includes

the .htaccess file is:

RewriteEngine On
RewriteBase /

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteCond %{REQUEST_URI} ^.*/wp-admin$
RewriteRule ^(.+)$ $1/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

<IfModule mod_security.c>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>

the functions.php file is:

<?php
if ( function_exists('register_sidebar') )
    register_sidebar(array(
        'before_widget' => '<li class="widget">',
        'after_widget' => '</li>',
        'before_title' => '<h2>',
        'after_title' => '</h2>',
    ));
remove_action('wp_head', 'wp_generator');// MY ADDED CODE
?>

any ideas please?

First try resetting Permalinks (or just swtich off) and see what happens.
What do you have set for URL’s in General Settings?

thank you webjunk

changing permalinks to default has solved problem. all 404 errors in google webmaster reach a page.

MEGA KARMA TO YOU