ios - Autolayout issue after updating to Swift 2.0 -

after downloading xcode 7.0 , migrating swift 2.0, getting following error.

attempt add nslayoutconstraint engine in exists. can cause engine corruption. break on void _nslayoutconstraintredundantadd() debug. logged once. may break in future.

seems few people got fixed updating xcode 7 beta 5