Server-side include

[lenisu]

I try to access a file in other directory using server-side include from
dreamweaver toolbox, and always give me this error:

Warning: main(admin_topics.php) [function.main]: failed to open stream: No
such file or directory in c:\programas\apache
group\Apache\htdocs\MyWebs\blg_blog2\index.php on line 31

Fatal error: main() [function.require]: Failed opening required
'admin_topics.php' (include_path='C:\php\pear') in c:\programas\apache
group\Apache\htdocs\MyWebs\blg_blog2\index.php on line 31
:sad;