PERMALINK STRUCTURE UPDATED – NOW SERVER ERROR

I changed my permalink structure from:

/index.php/%postname%/

to

/archives/%postname%/

and now i get this error: https://karreth.com/mac

it did say that i have changed the permalinks structure successfully!

what must i do? i do not want to loose everything! please, is there anyway for me to solve this?
i have read other posts and they asked fro the .htacces file – here is mine:

AddType application/x-httpd-php5 .php .php5# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /mac/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /mac/index.php [L]
</IfModule>

# END WordPress

thanks thanks thanks, if anyone can help me solve this!!!!

PLEASE,

max