Hello Guys, I have a process Model "A" who calls a subprocess &qu

I think there is a user input task without proper assignment. Some other nodes can also be assigned to user or groups. You have to fix this.

@derm160 you must assign at least one assignee(either user or group) for attended node(user input task) than problem will be tackle otherwise pass some user from subprocess and make that user as assignee at assignment tab

I've seen this with unattended nodes (script tasks, query DB, etc) not set correctly as unattended on the Assignment tab. The model thinks they are attended, without an assignee, when they should be set as 'Unattended'/system nodes.

For unattended nodes(script tasks, write to db, etc) you can use assignment as "Run as whoever started or designed this process model".
But your error "Error: Attended nodes must be assigned." indicates that there is an attended node like user input task which definitely needs assignment.

But if you still want no assignment then as a hack/alternative you can give the user input task assignment as -1 which will let it save and publish the process model.
The task will be visible to all users with System Administrator privilege with "[Group Name Not Available]" text in the "Sent to" field.

Hope this information is helpful.

If you do not have any attended nodes in subprocess it is better to have a swimlane configured with assignment as Run whoever designed the process model. That way all the new nodes if added will run in same fashion.

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Ignore earlier post. 

Had same thing happen to me.  Turns out in "General" for my subtask, quick task  checkbox was accidently checked while swapping between menus.

This causes the node to become attended despite no input tasks or start forms. 

Was likely your issue.