CocoaPods: App.xcworkspace does not exists
<p>This is what happened:</p>

<pre><code>$ pod lib lint

 -&gt; MXKit (5.2.2)
    - ERROR | [iOS] xcodebuild: Returned an unsuccessful exit code. You can use `--verbose` for more information.
    - NOTE  | [iOS] xcodebuild:  xcodebuild: error: 'App.xcworkspace' does not exist.

[!] MXKit did not pass validation, due to 1 error.
You can use the `--no-clean` option to inspect any issue.
</code></pre>

<p>I'm using:</p>

<ul>
<li>CocoaPods 1.0.1</li>
<li>Ruby 2.2.2</li>
<li>Xcode 8.0</li>
<li>OS X 10.12</li>
</ul>

<p>By add the <code>--verbose</code> option:</p>

<pre><code>$ pod lib lint --verbose

    MXKit (5.2.2) - Analyzing on iOS 8.0 platform.
  Preparing

Analyzing dependencies

Inspecting targets to integrate
  Using `ARCHS` setting to build architectures of target `Pods-App`: (``)

Fetching external sources
-&gt; Fetching podspec for `MXKit` from `/Users/Meniny/MXDevelop/MXProjects/MXKit-in-Objective-C`

Resolving dependencies of 

Comparing resolved specification to the sandbox manifest
  A MXKit

Downloading dependencies

-&gt; Installing MXKit (5.2.2)
  - Running pre install hooks

Generating Pods project
  - Creating Pods project
  - Adding source files to Pods project
  - Adding frameworks to Pods project
  - Adding libraries to Pods project
  - Adding resources to Pods project
  - Linking headers
  - Installing targets
    - Installing target `MXKit` iOS 8.0
      - Generating Info.plist file at
      `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Target
      Support Files/MXKit/Info.plist`
      - Generating module map file at
      `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Target
      Support Files/MXKit/MXKit.modulemap`
      - Generating umbrella header at
      `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Target
      Support Files/MXKit/MXKit-umbrella.h`
    - Installing target `Pods-App` iOS 8.0
      - Generating Info.plist file at
      `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Target
      Support Files/Pods-App/Info.plist`
      - Generating module map file at
      `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Target
      Support Files/Pods-App/Pods-App.modulemap`
      - Generating umbrella header at
      `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Target
      Support Files/Pods-App/Pods-App-umbrella.h`
  - Running post install hooks
  - Writing Xcode project file to
  `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Pods.xcodeproj`
  - Writing Lockfile in
  `../../../../../var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Podfile.lock`
  - Writing Manifest in
  `../../../../../private/var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/Pods/Manifest.lock`

Integrating client project

[!] Please close any current Xcode sessions and use `App.xcworkspace` for this project from now on.

Integrating target `Pods-App` (`../../../../../var/folders/rf/gj7xyczj0t14ggvbvh9jldf80000gn/T/CocoaPods/Lint/App.xcodeproj` project)
  Adding Build Phase '[CP] Embed Pods Frameworks' to project.
  Adding Build Phase '[CP] Copy Pods Resources' to project.
  Adding Build Phase '[CP] Check Pods Manifest.lock' to project.
  - Running post install hooks
  Pod installation complete! There is 1 dependency from the Podfile and 1 total pod
  installed.
   Building with xcodebuild. 
xcodebuild clean build -workspace App.xcworkspace -scheme App -configuration Release CODE_SIGN_IDENTITY=- -sdk iphonesimulator -destination id=DF8B8BB3-28D5-40FC-8150-7FEBD5BE12BF
2016-09-22 18:53:33.285 xcodebuild[44725:412823] [MT] DVTPlugInManager: Required plug-in compatibility UUID 8A66E736-A720-4B3C-92F1-33D9962C69DF for KSImageNamed.ideplugin (com.ksuther.KSImageNamed) not present
Build settings from command line:
    CODE_SIGN_IDENTITY = -
    SDKROOT = iphonesimulator10.0

xcodebuild: error: 'App.xcworkspace' does not exist.
 -&gt; MXKit (5.2.2)
    - ERROR | [iOS] xcodebuild: Returned an unsuccessful exit code.
    - NOTE  | [iOS] xcodebuild:  xcodebuild: error: 'App.xcworkspace' does not exist.

[!] MXKit did not pass validation, due to 1 error.
You can use the `--no-clean` option to inspect any issue.

/Users/Meniny/.rvm/gems/ruby-2.2.2/gems/cocoapods-1.0.1/lib/cocoapods/command/lib/lint.rb:75:in `block in run'
/Users/Meniny/.rvm/gems/ruby-2.2.2/gems/cocoapods-1.0.1/lib/cocoapods/command/lib/lint.rb:47:in `each'
/Users/Meniny/.rvm/gems/ruby-2.2.2/gems/cocoapods-1.0.1/lib/cocoapods/command/lib/lint.rb:47:in `run'
/Users/Meniny/.rvm/gems/ruby-2.2.2/gems/claide-1.0.0/lib/claide/command.rb:334:in `run'
/Users/Meniny/.rvm/gems/ruby-2.2.2/gems/cocoapods-1.0.1/lib/cocoapods/command.rb:50:in `run'
/Users/Meniny/.rvm/gems/ruby-2.2.2/gems/cocoapods-1.0.1/bin/pod:55:in `&lt;top (required)&gt;'
/Users/Meniny/.rvm/gems/ruby-2.2.2/bin/pod:23:in `load'
/Users/Meniny/.rvm/gems/ruby-2.2.2/bin/pod:23:in `&lt;main&gt;'
/Users/Meniny/.rvm/gems/ruby-2.2.2/bin/ruby_executable_hooks:15:in `eval'
/Users/Meniny/.rvm/gems/ruby-2.2.2/bin/ruby_executable_hooks:15:in `&lt;main&gt;'
</code></pre>

<p>Today I installed a new system (macOS Sierra 10.12) with Parallels Desktop 12, and:</p>

<ul>
<li>downloaded Xcode 8 (and installed the components)</li>
<li>installed rvm 1.27.0 (latest)</li>
<li>updated gem to 2.6.6</li>
<li>installed CocoaPods 1.0.1</li>
</ul>

<p>but the <code>pod lib lint</code> and <code>pod trunk push</code> commands still doesn't work. </p>

<p><code>:(</code></p>