I am unable to close Jira issues

[Henry]

When we try to close an issue from one of our projects, I get the error message below. 

An error occurred while executing a Set Field Value post-function: Field type com.atlassian.jira.issue.customfields.impl.UserCFType@45897316 of field Accepted by is not supported. : root cause: Field type com.atlassian.jira.issue.customfields.impl.UserCFType@45897316 of field Accepted by is not supported.

The field "Accepted by" is not signed for this ticket.

I am owner of this the project and have also admin rights.

[Fabio Racobaldo _Herzum_]

Hi @Henry ,

welcome to the Atlassian community!

On your close transition there's a post function that try to set that field as configured!

Please review you workflow first.

Hope this helps,

Fbaio

[Henry]

Hi @Fabio Racobaldo _Herzum_ ,

Thanks for yoru replay.
Nothing has been changed in the workflow and I can't find the field "UserCFType@45897316"

As far as I have heard, this only happens to 2 users. (I am one of them)