Article Manager problem

[maialee]

I installed Article Manager and everything went well, including the SQL query, but now when I try to open my site, I get the error message (I replaced the site path with "catalog"):

 

"Fatal error: Cannot redeclare tep_parse_topic_path() (previously declared in /catalog/includes/functions/articles.php:14) in /catalog/includes/functions/articles.php on line 14"

 

The referenced line 14 is the second line of this:

 

// Parse and secure the tPath parameter values

function tep_parse_topic_path($tPath) {

// make sure the topic IDs are integers

$tPath_array = array_map('tep_string_to_int', explode('_', $tPath));

 

I have tried a couple different versions and nothing seems to change this. Any idea what the problem might be??