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TRAILHEAD: Develop for Lightning Experience  =>
Build Flexible Apps with Visualforce Pages and Lightning Components =>
Use a Visualforce Page as a Component in a Lightning Page 

https://trailhead.salesforce.com/trails/lex_dev/projects/workshop-lightning-programmatic/steps/programmatic-step-3
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CHALLENGE ERROR: 
Challenge Not yet complete... here's what's wrong: 
Could not find a method named 'getIsClassic' in 'GetPropertiesApexController'. Check your code and try again.

The Lesson directives are clear, and everything works but the error persists on the challenge… I continued onto the next unit andeverything works… Except I get this error in the challenge… Note that this exercise was done on a brand new org.

It looks like a bug but hard to tell… Any work arounds?