I load my project from xcode 5 to xcode 6 and see error myProject-prefix.pch is not found in myProjectTests, I add this file and see new error
Ld /Users/will
Do as follows, changing [Precompile Prefix Header] with [no] and [Prefix Header] with empty field.
[Project] -[Basic] -[Apple LLVM6.1-Language] --[Precompile Prefix Header]-[no] --[Prefix Header]--[]