phpBB classified ad extention installation

[hbsnam]

Please help.

 

Get the following error/s on www.namibiacars.com/adverts.php

 

 

Warning: include(./language/lang_english/lang_main_ads.php) [function.include]: failed to open stream: No such file or directory in /home/namibiac/public_html/ads_mod/ads_common.php on line 37

 

Warning: include() [function.include]: Failed opening './language/lang_english/lang_main_ads.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/namibiac/public_html/ads_mod/ads_common.php on line 37

 

Warning: Cannot modify header information - headers already sent by (output started at /home/namibiac/public_html/ads_mod/ads_common.php:37) in /home/namibiac/public_html/includes/page_header.php on line 492

 

Warning: Cannot modify header information - headers already sent by (output started at /home/namibiac/public_html/ads_mod/ads_common.php:37) in /home/namibiac/public_html/includes/page_header.php on line 494

 

Warning: Cannot modify header information - headers already sent by (output started at /home/namibiac/public_html/ads_mod/ads_common.php:37) in /home/namibiac/public_html/includes/page_header.php on line 495

 

Can anybody tell me how to solve this, please?

 

Thanks

???