mautic campaign trigger

Description

having an issue with the campaign triggerit is never triggering and giving an issue "The error Doctrine\ORM\ORMInvalidArgumentException suggests that an entity is being referenced through a relationship without being properly persisted, specifically related to the Mautic\AssetBundle\Entity\Download#lead association. The core of the issue lies in how Doctrine is handling entities and their relationships in Mautic."
every time I trigger it does not work and throws an error
have two different mautic instances that are having execution problems
this is a job for someone who has done it and not for someone who has similar experiences in any other cms etc
mautic is very special and needs experienced people.