Let's encrypt Error

Hi just make a migration of my domains contents to a new server with Plesk Migrations- & Transfer-Manager
But the certificat won't be genereted see error log.
How can I retreive my certicates? Thanks for your help.

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Error: Error by the Installation of SSL-Zertifikats von Let's Encrypt: Failed letsencrypt execution: Saving debug log to /opt/psa/var/modules/letsencrypt/logs/letsencrypt.log...

Let's encrypt Error