functions_vbseo.php error include_once

Hi Guys

I created a plugin where I recall the file functions_vbseo, for using following instruction
$threadurl = vbseo_thread_url_row($threadrow);

The recall is executed with the code here below

Code:

if(defined('VBSEO_ENABLED') && VBSEO_ENABLED) 
            { 
                include_once 'includes/functions_vbseo.php';

The strange thing is that in some sites, mine included, i works fine, in some other sites following error appears:

Code:

 Warning: include_once(includes/functions_vbseo.php)  [function.include-once]: failed to open stream: No such file or  directory in [path]/includes/class_postbit.php(340) : eval()'d code on  line 429

Warning: include_once() [function.include]: Failed opening  'includes/functions_vbseo.php' for inclusion  (include_path='.:/usr/lib/php:/usr/local/lib/php') in  [path]/includes/class_postbit.php(340) : eval()'d code on line 429

In the sites living the a.m. error I tried to reach the file using the browser site /vbseo/includes/functions_vbse.php

And the result is

Page not found

regards

This call needs to be relative to your file's path and your file system for vbseo 3.6 (the article reflects the 3.3.x and lower location)

Try

include_once 'vbseo/includes/functions_vbseo.php';

Thanks

I will try

:bai