404 when Post topic in forum group

When click on "Post Topic" in the group page

http://www.mysocial.info/socialnetwork/grp.php?action=group&ID=2

to add a topic in the group forum, shows a 404 error.

How can I resolve?

I've tried to add a

RewriteBase /SocialNetwork/

into

/orca/.htaccess

and into

/groups/orca/.htaccess

but does'nt works.

any suggestions?

thanks

I have checked your site. Check whether the files are there.

OPS...

my correct site is

www.mysocial.info/socialnetwork

and the group page address is

http://www.mysocial.info/socialnetwork/grp.php?action=group&ID=2

if you click on VIEW ALL TOPICS

then shows 404 error

I've tried with

RewriteEngine on

RewriteBase /SocialNetwork/
or

RewriteBase /SocialNetwork/groups/
or

RewriteBase /SocialNetwork/Groups/orca/
or

RewriteBase /SocialNetwork/groups/orca/forum/

but nothing....

UP

Try replacing the .htaccess in the root.