Xcode 6 - Unknown type name 'NSString' / Expected identifier or '('

Question

When I am running my project in Xcode 6, I am having many weird errors.

Parse Issue - Unknown type name 'NSString'
Format argument not an NSString
Could not build module Foundation
Could not build module QuartzCore

All of these errors occur in Apple's header files such as: CAMediaTiming.h, NSObjCRuntime.h,NSZone.h,NSObject.h, CALayer.h, etc.

Unfortunately, the answers in here: ios - Parse Issues in NSObjCRuntime, NSZone, and NSObject did not work for me.

How do you recommend I fix these errors?

Answer 1

See if the Prefix Header file path is correctly placed under Build Settings tab. See the complete answer at the following link.

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