I'm receiving the following error despite the successful creation of the task as assigned:

Challenge Not yet complete... here's what's wrong: 
The Fulfillment Creation process does not appear to be working properly. Please check that your task was created with all of the field values set appropriately.

This is a really simple challenge and so I'm wondering if there's a problem with the check.  Here are my values:

Assigned To ID - [OpportunityLineItem].Opportunity.OwnerId
Priority - Normal
Status - Not Started
Subject - Update Explorer
Related To ID - [OpportunityLineItem].Opportunity.Id
Description - double check the explorer data is properly mapped to the fulfillment record.

Here is the task description:
Create a task for the sales rep to review the fulfillment, and remind rep to double check the explorer data is properly mapped to the fulfillment record.

• Assign a task to the opportunity owner.
• Add this task to the opportunity with Priority = Normal, Status = Not Started, and Subject = any sentence you choose to explain the task.

Stuck in challenge 4 .Can anyone rectify my error

Has anyone completed this trail? I am stomped on challenge number 3, regarding created the process for fulfillment. Any pointers or guidance would be appreciated.