Unable to build with xcode 9

[jeremy.gale]

Edit: Decided to report this as a separate issue:

Xcode 9 GM - Failed to create target code sign properties mapping, error

Hi there, I’m trying to build my app on with the Xcode 9 GM stack. It runs the tests and builds the archive fine. Here is the error I get: ▸ Archive Succeeded Using export options Generating export options using export-method input: ad-hoc Failed to create target code sign properties mapping, error: failed to run ruby script, output: {"error":"undefined method `[]' for nil:NilClass\n[\"/var/folders/90/5stft2v13fb_m_gv3c8x9nwc0000gn/T/__ruby-script-runner__154720919/script.rb:36:in `block (3 l…