I'm stuck on step #5 of Einstein Analytics and Discovery Insights Specialist superbadge

Deliver a Solution to Reduce Subscriber Attrition
Note: The requirements for this challenge changed because of new functionality introduced in recent releases. Analyze a dataset, create a story, and add its add it's prediction and prescriptions to a Salesforce object.

Can anyone help in completing this step.

Thnaks in advance!

I am presently stuck on Einstein Analytics and Discovery Insights Specialist Superbadge (https://trailhead.salesforce.com/en/content/learn/superbadges/superbadge_analytics_insights_specialist) Challenge #3

The dashboard designer tells me there is an error in my Attrition Cost step
 

Warning! 
Analytics encountered a problem with this step [Attrition_Cost_1]. 
Input stream not found

My SAQL query is this:

beattieSubscribers = load "Beattie_Subs"; tenuredSubscribers = filter beattieSubscribers by{{row(Tenure_Length_1.selection,[0],["min","max"]).asRange ("Tenure")}}; churnedSubscribers = filter tenuredSubscribers by 'Churn' == "Yes"; attrCost = churnedSubscribers * 950.00;

What am I missing?
 

When using the Salesforce Data Loader and trying to login with the oauth option. I get a blank screen. Why is that?