Day 05: Variables assertion error

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My question:
I am working on 30 Days Postman Developer challenge and stuck with the following error.
I have set the variables as expected at collection level and Global level but still see errors.

Details (like screenshots):

How I found the problem:

I’ve already tried:

Looks like you didn’t follow the instructions in step two. Click through the hyperlink to see how to set a new collection variable.

  1. Add a collection variable : Highlight in the request URL and set a new collection variable called coindeskBaseUrl with the value . Hover on the new variable to verify the variable is set at the proper scope (collection).