chrisbrosnan

I have found the answer elsewhere. The answer is as follows:

replace this:

 // Remove club member ID
 $user->delete_user_meta($user, $meta_key);
 // Add club member ID
 $user->add_user_meta($user, $meta_key, $meta_value); 

with this:

 // Remove club member ID
delete_user_meta($order->user_id, $meta_key);
// Add club member ID
add_user_meta( $order->user_id, $meta_key, $meta_value); 

• This reply was modified 9 years, 6 months ago by chrisbrosnan.

Thanks for the help @girlieworks. As you suggested it was caused by conflicting code. Specifically the wp_link_pages function was being defined both in the themes functions.php file and in the post-template.php file within the /wp-includes/ folder with instructions in one incidence contradicting the other. Many thanks.

No problem now.

I have figured it out.

Also, I have tried to fix the problem by selecting/deselecting “Anyone can register” under “Settings>General” but it made no difference.