Swift stdlib tool Error
I'm getting this error on compilation with Xcode 8.1 and Swift 3: Swift stdlib tool Error The end of the compile log looks like: /Users/..../Library/Developer/Xcode/DerivedData/.../Build/Products/Debug/.../Contents/Frameworks/libswiftCore.dylib: replacing existing signature /Users/..../Library/Developer/Xcode/DerivedData/.../Build/Products/Debug/.../Contents/Frameworks/libswiftCore.dylib: CSSMERR_CSP_INVALID_CONTEXT_HANDLE In architecture: x86_64 Probing signature of /Users/..../Library/Developer/Xcode/DerivedData/.../Build/Products/Debug/.../Contents/Frameworks/libswiftXPC.dylib /usr/bin