Failed to install 'cordova-plugin-firebase-analytics' pod Error on PhoneGap

Question

I'm developing a hybrid app which is connected to Firebase Analytics.

The enviroment:
Windows 10
Visual Studio 2015
DevExtreme Library
PhoneGap cli version 8.0.0
Cordova iOS version 5.0.0
Plugin added: phonegap-plugin-push, cordova-support-google-services and cordova-plugin-firebase-analytics.

Steps:

• Build a PhoneGap Zip.
• Upload the code on PhoneGap account.
• Build the app.

The problem:
The error is related to pod:

Installing "cordova-plugin-firebase-analytics" at "1.0.1" for ios
Failed to install 'cordova-plugin-firebase-analytics': Error: pod: Command 
failed with exit code 1

config.xml
The following is the last version of the config.xml:

<widget id="com.devexpress.apptemplate" version="1.0" versionCode="1">
  <name>ApplicationTemplate</name>
  <description>Template</description>
  <author email="email@sample.com" href="http://sample.com">Author</author>
  <preference name="permissions" value="none" />
  <preference name="prerendered-icon" value="true" />
  <preference name="android-windowSoftInputMode" value="adjustResize" />
  <preference name="SplashScreen" value="splash" />
  <preference name="SplashScreenDelay" value="60000" />
  <preference name="AutoHideSplashScreen" value="false" />
  <preference name="SplashShowOnlyFirstTime" value="false" />
  <preference name="FadeSplashScreen" value="false" />
  <preference name="ShowSplashScreenSpinner" value="false" />
  <preference name="DisallowOverscroll" value="true" />
  <preference name="StatusBarOverlaysWebView" value="false" />
  <preference name="StatusBarBackgroundColor" value="#000000" />
  <preference name="phonegap-version" value="cli-8.0.0" />
  <preference name="android-minSdkVersion" value="16" />
  <preference name="android-targetSdkVersion" value="26" />
  <preference name="cordova-ios" version="5.0.0" />
  <preference name="cordova-android" version="7.1.1" />
  <plugin name="cordova-plugin-splashscreen" onload="true" />
  <plugin name="cordova-plugin-whitelist" />
  <plugin name="cordova-plugin-ios-longpress-fix" />
  <plugin name="cordova-plugin-statusbar" onload="true" />
  <plugin name="phonegap-plugin-push" spec="2.1.2" />

  <platform name="android">
    <resource-file src="google-services.json" target="app/google-services.json" />
  </platform>
  <platform name="ios">
    <framework src="Firebase/Core" type="podspec" spec="~> 5.6"/>
    <resource-file src="GoogleService-Info.plist" />
  </platform>

  <plugin name ="cordova-support-google-services" />
  <plugin name ="cordova-plugin-firebase-analytics" />

  <plugin name="cordova-android-support-gradle-release" spec="^2.0.0">
    <variable name="PLAY_SERVICES_VERSION" value="+" />
  </plugin>
  <plugin name="cordova-android-firebase-gradle-release" spec="^2.0.0">
    <variable name="FIREBASE_VERSION" value="+" />
  </plugin>
  <access origin="*" />
</widget>

Does anyone know how to fix this?

Thank you in advanced,
Sara