Drupalchat integration with User Relationships Role disabled

hi.
I tried drupalchat 7.x.1.0-beta0. It works good.I installed UR 7.x-1.0-alpha2 module and created a relationship type named as friend.
In Administration » Configuration » DrupalChat under Relationship method , User Relationships Role Name to integrate with field is disabled.
how to solve this problem.

thanks in advance