problem with .txt file

I'm getting the following error:

You must set the ad network .txt file to be writable (or file is not within path).

Here's what I've done:
1) chmod the .txt
2) registered site URL is http://www.sharpwebservice.com/link_manager/
3) I've put the files in the same directory (ad_network_351.php and ad_network_351.txt) - http://www.sharpwebservice.com/link_manager/
4) the site is already php based
5) i'm trying to get that add to display at the top of this page (will move once I get it working) http://www.sharpwebservice.com/link_manager/

What have I done wrong? My guess is I have misunderstood where to put the two files (ad_network_351.php and ad_network_351.txt)

Very frustrating

 

.... 404

 

Can you double confirm that the ad_network_351.txt permissions have been changed to 666?

 

I can triple confirm that

 

Check the script you put in your footer file. You need to change "ad_network.txt" to ad_network_351.txt.

Caryl

 

It does have the 351. No problems there. Is it possible that I have an old version of php that isn't compatable?

 

Rewrite the code to include the exact path of your *.txt file. (line 34)

$ad_file = '/apache/server/yummie/link_manager/ad_network.351.txt";

 

still no luck...any more suggestions?