Cannot Invite People to my Groups

I am running Logos Bible Software 6.4 SR-3 6.4.0.0065, and when I try to invite people to join my groups through my web browser (Safari 9.0 and Google Chrome 43.0.2357.65), I get a screen that says, "faithlife Internal server error There was an error processing your request." I have attached an image of this error. I would love to get this error fixed ASAP. Thanks!