cordova-plugin-firebasex: Unable to install firebasex pods error

Installing firebasex on ios gives a broken pods:

Finding scripts for "before_plugin_install" hook from plugin cordova-plugin-firebasex on ios platform only.
No scripts found for hook "before_plugin_install".
Install start for "cordova-plugin-firebasex" on ios.
Beginning processing of action stack for ios project...
Action stack processing complete.
pods.json found in platforms/ios
Podfile found in platforms/ios
Adding pods since the plugin contained <podspecs>
Set pods.json for `declarations` - `use_frameworks!`
Added declaration line for `use_frameworks!`
Set pods.json for `libraries` - `Firebase/Core`
Added pod line for `Firebase/Core`
Set pods.json for `libraries` - `Firebase/Auth`
Added pod line for `Firebase/Auth`
Set pods.json for `libraries` - `Firebase/Messaging`
Added pod line for `Firebase/Messaging`
Set pods.json for `libraries` - `Firebase/Performance`
Added pod line for `Firebase/Performance`
Set pods.json for `libraries` - `Firebase/RemoteConfig`
Added pod line for `Firebase/RemoteConfig`
Set pods.json for `libraries` - `Fabric`
Added pod line for `Fabric`
Set pods.json for `libraries` - `Crashlytics`
Added pod line for `Crashlytics`
Wrote to pods.json.
Wrote to Podfile.
Running `pod install` (to install plugins)
Running command: pod install --verbose
==== pod install start ====

  Preparing

Analyzing dependencies

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

Finding Podfile changes
  A Crashlytics
  A Fabric
  A Firebase
  - Firebase

Resolving dependencies of `Podfile`

[!] CocoaPods could not find compatible versions for pod "Firebase/Analytics":
  In snapshot (Podfile.lock):
    Firebase/Analytics (= 6.1.0, ~> 6.1.0)

  In Podfile:
    Firebase/Analytics (~> 6.1.0)

None of your spec sources contain a spec satisfying the dependencies: `Firebase/Analytics (~> 6.1.0), Firebase/Analytics (= 6.1.0, ~> 6.1.0)`.

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 * out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.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.

Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by default.

/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:328:in `raise_error_unless_state'
/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:310:in `block in unwind_for_conflict'
/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in `tap'
/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in `unwind_for_conflict'
/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:257:in `process_topmost_state'
/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:182:in `resolve'
/Library/Ruby/Gems/2.3.0/gems/molinillo-0.6.6/lib/molinillo/resolver.rb:43:in `resolve'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/resolver.rb:88:in `resolve'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer/analyzer.rb:939:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer/analyzer.rb:937:in `resolve_dependencies'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer/analyzer.rb:118:in `analyze'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer.rb:398:in `analyze'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer.rb:221:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer.rb:220:in `resolve_dependencies'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/installer.rb:156:in `install!'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/command/install.rb:51:in `run'
/Library/Ruby/Gems/2.3.0/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.3.0/gems/cocoapods-1.7.5/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:22:in `load'
/usr/local/bin/pod:22:in `<main>'

Command finished with error code 31: pod install,--verbose
Failed to install 'cordova-plugin-firebasex': Error: pod: Command failed with exit code 31
    at ChildProcess.whenDone (/node_modules/cordova-common/src/superspawn.js:135:23)
    at ChildProcess.emit (events.js:200:13)
    at maybeClose (internal/child_process.js:1021:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
pod: Command failed with exit code 31
Error: pod: Command failed with exit code 31
    at ChildProcess.whenDone (/node_modules/cordova-common/src/superspawn.js:135:23)
    at ChildProcess.emit (events.js:200:13)
    at maybeClose (internal/child_process.js:1021:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)

Ionic:

   Ionic CLI          : 5.0.1 (/usr/local/lib/node_modules/ionic)
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.2.3

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : android 8.0.0, ios 5.0.1
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.0.1, (and 27 other plugins)

Utility:

   cordova-res : 0.5.2
   native-run  : 0.2.5

System:

   Android SDK Tools : 26.1.1 (/Users/me/Library/Android/sdk)
   ios-deploy        : 1.9.4
   ios-sim           : 8.0.2
   NodeJS            : v12.4.0 (/usr/local/Cellar/node/12.4.0/bin/node)
   npm               : 6.9.0
   OS                : macOS Mojave
   Xcode             : Xcode 10.3 Build version 10G8

Update ==================== > it looks the plugin conflicts in somehow with

• cordova-support-google-services

• cordova-plugin-firebase-inappmessaging

• cordova-plugin-google-analytics

when i remove the above plugins and then installed firebasex again, the build finished but with errors in pods, however i opened the xcode and build it from there it did work. not sure what shall i do next to build the project using cordova cmd line