100+ “Class implemented in both MapKit and VectorKit” warnings with Xcode 9.0.1 and above

Question

While running my project (which doesn\'t even use MapKit), my console gets spammed with more than a hundred class duplicate warnings:

objc[63

Answer 1

Got the same issue on 9.0.1.

• You should quit Xcode and all Simulators.
• Run rm -rf ~/Library/Developer/Xcode/DerivedData/ModuleCache.
• Start Xcode again.

This issue was solved for me.