unicode safety

awx/main/fields.py

@@ -16,6 +16,7 @@ from django.db.models.fields.related import (
     ManyRelatedObjectsDescriptor,
     ReverseManyRelatedObjectsDescriptor,
 )
+from django.utils.encoding import smart_text
 
 # AWX
 from awx.main.models.rbac import RolePermission, Role, batch_role_ancestor_rebuilding
@@ -66,7 +67,7 @@ def resolve_role_field(obj, field):
 
     if len(field_components) == 1:
         if type(obj) is not ImplicitRoleDescriptor and type(obj) is not Role:
-            raise Exception('%s refers to a %s, not an ImplicitRoleField or Role' % (field, str(type(obj))))
+            raise Exception(smart_text('{} refers to a {}, not an ImplicitRoleField or Role').format(field, type(obj)))
         ret.append(obj)
     else:
         if type(obj) is ManyRelatedObjectsDescriptor: