I receive an error when I start the dataflow in the Accelerate Analytics with Apps > Sales Analytics App > Create Sales Analytics Using the Wizard Trailhead. Template used: Sales Analytics 4.0 on Oct 24, 2017.

I am able to create the Sales Analytics app and get to step 12 of the "Sync Analytics Data with Trailhead Data Manager" section of the trail. As the dataflow is running, I recieve the following error when I check my dataflow (screenshot below): 

Something went wrong while executing the Find_Last_Stage_Updates node: Sort dimension/measure not found in Edgemart: Unique_Sort_Key (02K6A0000000fK7UAI_03C6A0000003dhXUAQ)

Completed the challenge.  Added the notification (see attached image) in the Wave developer org.  It looks like it did not save the first time.  Added the notification a 2nd time, as shown in screen capture. 

​I keep getting

Challenge Not yet complete... here's what's wrong: 
The 'Top Laptop Industry' lens was not found. Please follow the requirements and ensure everything is setup correctly

I have named the Lens as step 2 - Enter D01 - Laptops Salespeople - Wall of Fame as the title AND/OR result set Top Laptop Industry

Neither seem to work. I have refresed the screen, even cleared cookies and rebooted the computer.