Cocoapods will not install?

[!] Unable to find a specification for `Firebase/Analytics`

You have either:
 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
 * mistyped the name or version.
 * not added the source repo that hosts the Podspec to your Podfile.

I have added pods painlessly to many projects in the past, but now, no new pods will install. I ran pod repo update, I updated my Cocoapods version, turned use_frameworks! on and off, and I am out of ideas.

here is the Podfile

# Uncomment the next line to define a global platform for your project
platform :ios, '13.0'

target 'My App' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!
  #use_modular_headers!

  # Pods for My App
  pod 'RxSwift'
  pod 'RxAlamofire'
  pod 'Alamofire'
  pod 'Fabric'
  pod 'Crashlytics'
  source 'https://github.com/lixiang1994/Specs'
  pod 'Loading'

end

Solution

Add this to the top of your file:

source 'https://github.com/CocoaPods/Specs.git'

Cocoapods will add that source by default if no other source is present. By adding your own source Cocoapods assumes everything can be found there.