Error al crear mi propio pod con ObjectiveC

Estoy creando pod en este gran tutorial. https://www.raywenderlich.com/99386/create-cocoapod-swift .

Uso Objective C en lugar de Swift. Se produjo un error en este paso:

pod repo push MyProj MyProj.podspec --verbose 

Salida:

 Validación de especificaciones
     MyProj (0.1.0) - Analizando en la plataforma iOS 9.0.
   Preparando

 Cloning spec repo `******` from `https: //github.com / ****** / PodSpecs.git`
   $ /Applications/Xcode.app/Contents/Developer/usr/bin/git clon https://github.com/******/PodSpecs.git ******
   Clonación en '******' ...
   advertencia: Parece que ha clonado un repository vacío.
  -> MyProj (0.1.0)
     - ERROR |  [iOS] unknown: Encontrado un error desconocido (No se puede crear una fuente con URL https://github.com/******/PodSpecs.git
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/sources_manager.rb:42:in `find_or_create_source_with_url '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer/analyzer.rb:654:in `bloque en las fonts '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer/analyzer.rb:653:in `map '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer/analyzer.rb:653:in `sources '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/installer.rb:144:in `resolve_dependencies '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:373:in `block in download_pod '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:373:in `each '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:373:in `download_pod '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:269:in `block in perform_extensive_analysis '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:263:in `each '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:263:in `perform_extensive_analysis '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/validator.rb:81:in `validate '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:125:in `block en validate_podspec_files '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:119:in `each '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:119:in `validate_podspec_files '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:64:in `run '
 /Library/Ruby/Gems/2.0.0/gems/claide-1.0.0/lib/claide/command.rb:334:in `run '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command.rb:50:in `run '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/bin/pod:55:in `'
 / usr / local / bin / pod: 23: en 'cargar'
 / usr / local / bin / pod: 23: en `'
 ) durante la validation.

 [!] La especificación `MyProj.podspec` no valida.

 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:130:in `block en validate_podspec_files '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:119:in `each '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:119:in `validate_podspec_files '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command/repo/push.rb:64:in `run '
 /Library/Ruby/Gems/2.0.0/gems/claide-1.0.0/lib/claide/command.rb:334:in `run '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/lib/cocoapods/command.rb:50:in `run '
 /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.0.1/bin/pod:55:in `'
 / usr / local / bin / pod: 23: en 'cargar'
 / usr / local / bin / pod: 23: en `'

Mi file podspec:

  Pod :: Spec.new do | s |

 s.platform =: ios

 s.ios.deployment_target = '9.0'

 s.name = "MyProj"

 s.summary = "MyProj le permite a un usuario crear su propio timer".

 s.requires_arc = true

 s.version = "0.1.0"

 s.license = {: type => "MIT",: file => "LICENCIA"}

 s.author = {"*** ***" => "***@***.com"}

 s.homepage = "https://github.com/******/MyProj"

 s.source = {: git => "https://github.com/******/MyProj.git",: tag => "# {s.version}"}

 s.framework = "UIKit"

 s.dependency 'ReactiveCocoa', '~> 2.5.0'

 s.source_files = "MyProj / ** / *. {h, m}"

 s.resources = "MyProj / ** / *. {png, jpeg, jpg, guión gráfico, xib}"

 fin

Hice todos los pasos anteriores en el tutorial.

Usando la última versión de cocoapods.

¿Cómo puedo solucionar este error?

Estaré agradecido por cualquier ayuda!