Why can't I build the Titanium Appcelerator project for an iOS device?

Question

iOS

During the build from under the Titanium Command-Line

solaris-6:app at$ appc ti build --device-id 814afcb29c793aea10b182b53f3f629b73ed1a39 --platform ios --target iphone
Appcelerator Command-Line Interface, version 5.3.1
Copyright (c) 2014-2016, Appcelerator, Inc.  All Rights Reserved.

throws this error:

.....
INFO]  Removing files
[INFO]  Optimizing .plist and .png files
[INFO]  Invoking xcodebuild
[ERROR] ** BUILD FAILED **
[ERROR] The following build commands failed:
[ERROR]         CodeSign build/Products/Debug-iphoneos/Anna-inzicht.app
[ERROR] (1 failure)

AppseleratorStudio (Titanium), build: 4.6.0.201605201934
MacBook Pro
iPad mini, OS 8.1.
When trying to build through Appcelerator Studio itself, the following is displayed:

2016-08-22T08:48:24.385Z | DEBUG  | getTiDefaultPath /Users/at/Library/Application Support/Titanium
    2016-08-22T08:48:24.386Z | DEBUG  | active sdk install path /Users/at/Library/Application Support/Titanium
    2016-08-22T08:48:26.476Z | DEBUG  | to download {"modules":[{"oses":["linux","win32","osx"],"platforms":["iphone","android"],"required":true,"partner_id":"A0B129A418829127EC551EB8ADB0D1CC","partner_name":"Appcelerator","name":"Hyperloop","description":"Gain complete access to native APIs in your Titanium mobile applications.","id":"hyperloop","guid":"99a136cd-4e51-40da-bcdb-d514f5895fb5","version":"1.2.6","url":"http://appcelerator-modules.s3.amazonaws.com/hyperloop-1.2.6.zip","min_mobilesdk_version":"5.4.0"}],"components":[]}
    [ERROR] :  Invalid "--device-id" value ""
    Available iOS Devices:
      814afcb29c793aea10b182b53f3f629b73ed1a39  iPad mini
      itunes                                    iTunes Sync
    For help, run: titanium.js help build

How to be?