Ralph Asset Management System - User Group

Import virtual server from csv

I am trying to import a .csv file to add virtual machine, but i get this error:
Numero linea: 1 - BaseObject matching query does not exist.

OrderedDict([(‘baseobject_ptr’, ‘845’), (‘id’, ‘845’), (‘created’, ‘2020-06-11 15:35:22’), (‘modified’, ‘2020-06-11 15:35:22’), (‘content_type’, ‘17’), (‘parent’, ‘823’), (‘remarks’, ‘’), (‘service_env’, ‘821’), (‘configuration_path’, ‘’), (‘status’, ‘2’), (‘type’, ‘3’), (‘hostname’, ‘qdb-02-prod’), (‘sn’, ‘’), (‘cluster’, ‘’), (‘tags’, ‘’)])

Traceback (most recent call last):
File “/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/resources.py”, line 374, in import_data
self.import_obj(instance, row, real_dry_run)
File “/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/resources.py”, line 238, in import_obj
self.import_field(field, obj, data)
ralph.assets.models.base.DoesNotExist: BaseObject matching query does not exist.

can someone help me?