fastlane: Fastlane fail with: Invalid code signing settings

I’m always getting Your project settings define invalid code signing settings. Locally it’s working but not on the CI server. I think I have everything fine but something is missing:

Variable Dump:
{:DEFAULT_PLATFORM=>:ios, :ENVIRONMENT=>nil, :PLATFORM_NAME=>:ios, :LANE_NAME=>"ios beta", :CERT_FILE_PATH=>"./YSLE7K35GW.cer", :CERT_CERTIFICATE_ID=>"YSLE7K35GW", :SIGH_PROFILE_PATH=>"/Users/distiller/x-ios-app/AppStore_x.x.x.mobileprovision", :SIGH_UDID=>"076b19d1-1dcd-4191-9c6a-cbea25015ggc", :BUILD_NUMBER=>"10"}

I used Code Signing: Best Solution - Using environment variables approach.

Version Successfully installed fastlane-1.26.0

Fastfile

  desc "**Build** the app"
  lane :build do |options|
    # Code Signing
    if options[:sign]
      cert
    end

    # Provisioning profiles
    sigh
    # Use the UDID of the newly created provisioning profile
    ENV["PROFILE_UDID"] = lane_context[SharedValues::SIGH_UDID]

    # App build number
    if options[:increment]
      increment_build_number
    end

    # Build your app
    gym
  end

  desc "Submit a new Beta Build to **TestFlight** and **Crashlytics**"
  desc "This will also make sure the profile is up to date"
  lane :beta do |options|
    # Notifications
    if options[:slack]
      $use_slack = true
    else 
      $use_slack = false
    end
    # Steps
    cert
    build(release: false, sign: true, increment: true)
    testflight(skip_deploy: true) # Skip the distribution of the app to all beta testers
    crashlytics(crashlytics_path: './Pods/Crashlytics/Crashlytics.framework', ipa_path: './build/X.ipa')
  end

Gymfile

scheme "X"

# sdk "8.0"

clean true

# store the ipa in this folder
output_directory "./build"

# the name of the ipa file
output_name "X"

Log

[06:49:37]: --- Step: cert ---
[06:49:37]: ------------------
[06:49:47]: Starting login with user 'services@x.x'
[06:50:00]: Successfully logged in
[06:50:02]: Certificate P5YNN9KJL8 (X) can't be found on your local computer
[06:50:02]: Couldn't find an existing certificate... creating a new one
1 key imported.
1 certificate imported.
[06:50:04]: Successfully generated YSLE7K35GW which was imported to the local machine.
[06:50:07]: Use signing certificate 'YSLE7K35GW' from now on!
[06:50:07]: --------------------------------------
[06:50:07]: --- Step: Switch to ios build lane ---
[06:50:07]: --------------------------------------
[06:50:07]: Cruising over to lane 'ios build' 🚖
[06:50:07]: ------------------
[06:50:07]: --- Step: cert ---
[06:50:07]: ------------------
[06:50:07]: Starting login with user 'services@x.x'
[06:50:08]: Successfully logged in
[06:50:09]: Certificate P5YNN9KJL8 (X) can't be found on your local computer
[06:50:10]: Found the certificate YSLE7K35GW (X) which is installed on the local machine. Using this one.
[06:50:10]: Use signing certificate 'YSLE7K35GW' from now on!
[06:50:10]: ------------------
[06:50:10]: --- Step: sigh ---
[06:50:10]: ------------------
[06:50:11]: Starting login with user 'x@x.x'
[06:50:12]: Successfully logged in
[06:50:12]: Fetching profiles...
[06:50:15]: No existing profiles, creating a new one for you
[06:50:16]: The name 'x.x.x AppStore' is already taken, using another one.
[06:50:16]: Creating new provisioning profile for 'x.x.x' with name 'x.x.x AppStore 1442497816'
[06:50:16]: Downloading provisioning profile...
[06:50:18]: Successfully downloaded provisioning profile...
[06:50:18]: Installing provisioning profile...
./AppStore_x.x.x.mobileprovision

Build log

[06:50:21]: -----------------
[06:50:21]: --- Step: gym ---
[06:50:21]: -----------------
[06:50:21]: Installing provisioning profile...
[06:50:22]: xcrun xcodebuild -list -workspace './X.xcworkspace'
[06:50:23]: xcrun xcodebuild -showBuildSettings -workspace './X.xcworkspace' -scheme 'X'

+------------+-----------------------------+
|          Building Application 🚀          |
+------------+-----------------------------+
| Workspace  | ./X.xcworkspace          |
| Scheme     | X                        |
| Platform   | iOS                         |
| Xcode Path | /Applications/Xcode-6.4.app |
+------------+-----------------------------+

[06:50:24]: set -o pipefail && xcodebuild -workspace './X.xcworkspace' -scheme 'X' -destination 'generic/platform=iOS' -archivePath '/Users/distiller/Library/Developer/Xcode/Archives/2015-09-17/X 2015-09-17 06.50.24.xcarchive' clean archive | xcpretty

-----
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▸ Cleaning Pods/Runes [Debug]
▸ Cleaning Pods/Box [Debug]
▸ Cleaning Pods/Dodo [Debug]
▸ Cleaning Pods/Argo [Debug]
▸ Cleaning Pods/KeychainAccess [Debug]
▸ Cleaning Pods/RMActionController [Debug]
▸ Cleaning Pods/Realm [Debug]
▸ Cleaning Pods/RMDateSelectionViewController [Debug]
▸ Cleaning Pods/RealmSwift [Debug]
▸ Cleaning Pods/Pods-X [Debug]
▸ Cleaning X/X [Debug]
▸ Building Pods/Box [Release]

⌦  Code Sign error: No code signing identities found: No valid signing identities (i.e. certificate and private key pair) matching the team ID “(null)” were found.



⌦  CodeSign error: code signing is required for product type 'Framework' in SDK 'iOS 8.4'


▸ Building Pods/Runes [Release]

⌦  Code Sign error: No code signing identities found: No valid signing identities (i.e. certificate and private key pair) matching the team ID “(null)” were found.



⌦  CodeSign error: code signing is required for product type 'Framework' in SDK 'iOS 8.4'


** ARCHIVE FAILED **