How to create Folder in Attachments?

hi i am creating workflow for archieval that copy item from one list to another with attachments.

but did everything it is working fine on whenever attachments alredy exists on item its working

other wise its giving me this error

{
"error": {
"code": "-2130247142, Microsoft.SharePoint.SPException",
"message": {
"lang": "en-US",
"value": "Folder ""40"" does not exist."
}
}
}