Failure on fbsimctl install

[vspedr]

[09/11/2017] EDIT: NOT an issue with detox, DO NOT use the ARCHS=i386 flag! This is my failed attempt of a workaround 😅
Everything below this line is my original post, for record purposes only, don't do the same.

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I managed to work around this issue, so I thought it would be nice to leave it here in case someone runs into the same problem :)

I followed through the "Getting Started" guide and everything worked nicely until detox test failed with the following message, along with a bunch of other Class foo is implemented in both ... warnings.

  1)  "before all" hook:
     Error: Command failed: fbsimctl --json 546896F6-37A1-4552-B4F2-178D49363585 install /Users/user/Projects/myapp/ios/build/Build/Products/Debug-iphonesimulator/myapp.app

I copied the complete fbsimct ... command and tried running it separately, which gave me another message:

{"event_type":"discrete","timestamp":1496770868,"subject":"Error Domain=com.facebook.FBSimulatorControl Code=0 \"Simulator does not support any of the architectures ([x86_64]) of the executable at \/Users\/user\/Projects\/myapp\/ios\/build\/Build\/Products\/Debug-iphonesimulator\/myapp.app\/myapp. Simulator Archs ([i386])\" UserInfo={NSLocalizedDescription=Simulator does not support any of the architectures ([x86_64]) of the executable at \/Users\/user\/Projects\/myapp\/ios\/build\/Build\/Products\/Debug-iphonesimulator\/myapp.app\/myapp. Simulator Archs ([i386])}","event_name":"failure"}

The solution: added the following flags to my xcodebuild command in detox config:

{
  ...
  "build": "xcodebuild ARCHS=i386 ONLY_ACTIVE_ARCH=NO ...
  ...
}

[LeoNatan]

This looks like an issue on your side. Your project is either configured to only build 64bit binaries, or you have built a debug build with active architecture only, targeting a 64bit simulator, then try to run on a 32bit simulator.