Incompatibility - Group Hierarchy and Classifieds


When I have both the classifieds plugin and BP group hierarchy plugin activated, it returns the following error.

Warning: Call-time pass-by-reference has been deprecated in /xyz-domain/wp-content/plugins/bp-group-hierarchy/bp-group-hierarchy-classes.php on line 229

I will forward this to DDean, the dev behind Group Hierarchy... will the classifieds dev be informed? Does it sound like this issue is from bp group hierarchy ? or vice versa?