Thanks @Robkk
@netweb said he would help as soon as he gets time and me some more resources to look at.
Digging into it more I think my class in not initiating correctly. “ExpressionEngine” is my class. I tried to echo anything after the Line 1709 “$converter = bbp_new_converter( $row->meta_value );” on /wp-content/plugins/bbpress/includes/users/functions.php and it will not.
I confirm that my class name is correct in metadata and file name is the same.
So I think there is something wrong with my custom class converter but not sure how to tell what it is. I also tried commenting all the methods out one by one but still get same error.