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iOS Objective-C Basics Scope and Loops Review Scope and Loops

Compiler error when declaring bool

When completing the "Review Scope and Loops" code challenge in Objective-C Basics, declaring the bool isComplete returns an error in the preview:

too many errors emitted, stopping now 20 errors generated.

I'm declaring the bool as such: bool isComplete;

I've also tried: BOOL isComplete;

This does not return errors in Xcode, and I do believe this is the way bools are declared...

bool isComplete;