I have tried to append a new contact Contact saved When I tried to search this is the answer
You have experienced what is called, a CiviCRM fatal error, or as I like to say, yellow banner of death.
Please update your question with Civi version and CMS info too. Then Start here: https://docs.civicrm.org/sysadmin/en/latest/troubleshooting/
Then share whats in the logs.