error MT0117: Can't launch a 32-bit app on a simulator that only supports 64-bit apps (iPhone 6s)

If you change the support architectures to "i386 + x86_64" or "x86_64", it should solve your problem.

You can right click your project -> properties -> iOS build -> change "Supported Architectures" to "i386 + x86_64" or "x86_64"