How to auto approve a task?

Question

I have a task assigned to a Approver in SP 2013 workflow. I want to auto approve the task after a certain period of inactivity using the workflow. I am setting the below fields on the task item

Set Task Outcome to Approved
Set Task Status to Completed
Set % Complete to 1

But the workflow is throwing the following error, when I check the outcome return value if outcome equals Approved

Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal)

How can I auto approve a task?

Thanks

Answer 1

since this way was throwing error, i used REST API to achieve the auto approve/reject the task. i followed the below links to get this done

Updating list items using SharePoint 2013 workflow engine

Approve workflow tasks using REST API in SharePoint 2013

Hope this helps someone

Answer 2

This can be done by using a Second workflow (WF) on the task list, but the second WF does need to be a SP2010 WF not SP2013 WF.

Related Question: How can you do task auto approval in SharePoint Designer workflow after their respective due date