Start event plus timer nodes

Is it possible to have a start even plus other timer nodes? My use case is as follows: 

1. A task is assigned to a supervisor

2. After one week, if the supervisor has NOT completed the task, would like for Appian to send out an email from a particular mailbox (which this option is not available through ESCALATIONS)

I thought I had seeing something as below but when I try it, I get the error: ERROR:EVAL:@reason=index. Am I doing something wrong?

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