Hi and thanks for reaching out!
There are 2 problems: 1) that you don’t have bbp-private-groups plugin installed; and 2) that my check for the existence of bbp-private-groups is happening at the wrong place/time.
I’ll put out a fix for issue #2, but the fastest workaround is to install the plugin outlined in #1. As explained in the product page, bbpnns-private-groups-bridge is a bridge between bbpnns and bbp-private-groups, so it really can’t do anything unless you’re using that plugin.
Leave the bridge plugin inactive for now and you’ll get notified of the available update later today.