Unable to sign iOS app

Build is complaining, at very end:


▸ Building library libRhodes.a
▸ Building library libRhodes.a
▸ Building SpatialVis/rhorunner [Release]
▸ Check Dependencies

❌ Code signing is required for product type 'Application' in SDK 'iOS 10.3'


** BUILD FAILED **


The following build commands failed:
Check dependencies
(1 failure)
rake aborted!
Command '/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild' with args 'build -target rhorunner -configuration Release -sdk iphoneos10.3 -project SpatialVis.xcodeproj' failed with code 65
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/gems/rhodes-5.5.18/platform/iphone/rbuild/iphonecommon.rb:103:in `run_and_trace'
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/gems/rhodes-5.5.18/platform/iphone/rbuild/iphone.rake:2422:in `block (3 levels) in <top (required)>'
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/gems/rhodes-5.5.18/Rakefile:4411:in `invoke'
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/gems/rhodes-5.5.18/platform/iphone/rbuild/iphone.rake:2345:in `block (3 levels) in <top (required)>'
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/gems/rhodes-5.5.18/Rakefile:4411:in `invoke'
/Users/jon/.rvm/gems/ruby-2.3.4@global/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/bin/ruby_executable_hooks:15:in `eval'
/Users/jon/.rvm/gems/ruby-2.3.4@rhodes_master-pre-6-0_5.5.18_c90eb3b4/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => build:iphone:rhodes_old
(See full trace by running task with --trace)

Yet, I specified code signing in build.yml:

codesignidentity: 'iPhone Developer'
provisionprofile: '(profile uuid)'


I suspect some messages at the start of the build:

Build for iOS, set required XCode version...
> xcode-select --print-path
required_xcode_app_version: '8.3.2'
xcode_select_path: '/Applications/Xcode.app/Contents/Developer'
xcode_app_path: '/Applications/Xcode.app'
xcode_app_name: 'Xcode.app'
xcode_app_directory: '/Applications'
> defaults read /Applications/Xcode.app/Contents/version CFBundleShortVersionString
xcode_app_version: '8.3.2'
iphone.rake execute
ENV["RHO_BUNDLE_BUILD_LOG_FILE"] =
[INFO] Starting rhodes build system using ruby version: 2.3.4
$$$ XCode version is 8.3.2
$$$ XCode version is 8.3.2
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
security: SecPolicySetValue: One or more parameters passed to a function were not valid.
Processed MobileProvision UUID = (uuid that matches the one specified in my build.yml)
SDK = iphoneos10.3