Raise exceptions when passed bad ways to join
Raise exceptions when passed bad ways to join

chris48s/mapit,Sinar/mapit,Code4SA/mapit,New-Bamboo/mapit,Code4SA/mapit,opencorato/mapit,opencorato/mapit,Code4SA/mapit,New-Bamboo/mapit,Sinar/mapit,opencorato/mapit,chris48s/mapit,chris48s/mapit