[SOLVED] Error: Warning: implode() [function.implode]: Invalid arguments passed in .

Hi -

Sorry to post twice in one day but having to recreate my website has led to all sorts of problems:

I am getting the following error in posts:

Warning: implode() [function.implode]: Invalid arguments passed in /home/...../...../wp-content/themes/atahualpa333/functions/bfa_postinfo.php on line 14


Line 14 contains: $meta_values = implode(", ", get_post_custom_values($meta_key));

And is part of this function:

// Callback function for post meta replacement
function meta_values($matches) {
$meta_key = $matches[1];
// "get_post_custom_values" returns an array. Turn it into a string, separated by commata
$meta_values = implode(", ", get_post_custom_values($meta_key));
return $meta_values;

How do I fix this?

Thanks so much.