in nUI_UnitRole.lua
line 354
replace
Code:
role_tank, role_healer, role_damage = UnitGroupRolesAssigned( unit_id );
with
Code:
role_assigned = UnitGroupRolesAssigned( unit_id );
role_tank = role_assigned == 'TANK';
role_healer = role_assigned == 'HEALER';
role_damage = role_assigned == 'DAMAGER';