Improved wording.

app/models/role.rb

@@ -220,7 +220,7 @@ returns
     normal_permissions = (all_permissions - admin_permissions) | (admin_permissions - all_permissions) # all other permissions besides admin.*/ticket.agent
     return true if default_at_signup != true # means if default_at_signup = false, no need further checks
     return true if self.permission_ids.all? { |i| normal_permissions.include? i } # allow user to choose only normal permissions
-    raise Exceptions::UnprocessableEntity, 'Cannot set default at signup when role has admin and ticket agent properties'
+    raise Exceptions::UnprocessableEntity, 'Cannot set default at signup when role has admin or ticket.agent permissions.'
   end
 
 end