Nutrient resource issue
While running your app after updating Nutrient, you may encounter a popover saying that the version of the PSPDFKit.bundle you’re using does not match the version expected in Nutrient. This is an Xcode problem and is not caused by Nutrient.
When you see this happening, deleting Xcode’s Derived Data, located at ~/Library/Developer/Xcode/DerivedData, will solve the problem.