Ultimate SEO URL questions?

I have use Ultimate_SEO_URLs_v2.100,and it is so good!But now i want to make a change :from AA-BB-CC.html to AA_BB_CC.html,so what will i do?

And what i am worried is that 301 !When it is changed,if bot visit AA-BB-CC.html,can it visit to AA_BB_CC.html with auto 301?

Why do you think that underscores would be better than dashes?

Hello, Kim

I tried very hard to install SEO on my site and I did follow every instruction. It never works right on my site. Now my site is broken completely!

The error message is:

1054 Unknown column 'c.parent_id' in 'on clause'
in:
[SELECT c.categories_id as id, c.parent_id, cd.categories_name as cName, cd2.categories_name as pName FROM categories c, categories_description cd LEFT JOIN categories_description cd2 ON c.parent_id=cd2.categories_id AND cd2.language_id='1' WHERE c.categories_id=cd.categories_id AND cd.language_id='1']

Please take a look at my site at https://www.loveinrose.com

This is what I put onto my .htaccess file under the root.

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^.loveinrose.com [nc]
RewriteRule (.*) http://www.loveinrose.com/$1 [R=301,L]

Thank you!!

B.S. I fount out after I delete the file "configure_ultimate_seo" file from my server, the website returns to be normal. (I leave all other files untouched in my server) There got to be somthing wrong with this file.