Lingering nodes must be attended

I am Trying to publish my process model, it throws an error " Lingering nodes must be attended".

I had assigned swim Lanes and nodes appropriately.

Note: One Important thing need to mention here is i am using "Copy Document Service" and in properties, Assignment tab , the process model is assigned to "toUser(loggedInUser())" .

How to solve this error.

Thanks in advance

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