If you get this error from Simple Forum script then u need to edit .htacess
Code:Options +FollowSymLinks
Options -Indexes
DirectoryIndex index.php index.html
RewriteEngine on
# RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteCond $1 !^(index\.php|img|css|js|install|robots\.txt|favicon\.ico|update\.php)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]
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Replace it with
Code:RewriteEngine On
DirectoryIndex index.php index.html
# RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteCond $1 !^(index\.php|img|css|js|install|robots\.txt|favicon\.ico|update\.php)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
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Note: if your server is set as a CGI then u need to change the permission from the index.php file to 755.