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We are running Nintex WF 2016 on-prem.

I have a workflow that calls a sub-workflow.  The main workflow run fine, it calls the sub-workflow and executes several actions.  However it errors just before a "Pause for Item Update" action that causes the sub and main workflow to end.

The error in the main workflow is:  Error retrieving workflow data. Invalid workflow instance Id. Workflow Id's must be in the format (xxxxxxx-xxxx-xxxx-xxxxxxxxxxxx).  The error in the sub-workflow is An error has occurred in <sub-wf name>.

I have gotten this error previously.  Republishing the sub-workflow would resolve the error.  But now that "fix" no longer works.  I have not found anything that references this error.

Has anyone else ever see this error?  Any ideas what the cause may be?  (The SharePoint logs don't provide any helpful info.)

Regards,

Ken

Ken You say that the error occurs before the Pause for Item Update. Can you post the configuration of the action preceding the pause?

As it turns out, this is the error that occurs when you have a Check-In action without the item being checked out.  

Ken

This issue can occur when parent WF is trying start child WF and that child WF is already running. 

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