Color definition doesn`t work

[wo-github]

If I add the color definition in my config.xml, the app couldn`t build or run on a real device.
The source:
https://github.com/arnesson/cordova-plugin-firebase/blob/master/docs/NOTIFICATIONS.md#configure-firebase-color
The error:
cordova-custom-config: Error updating config for platform 'android': Cannot use absolute path on element
Plugin List:
cordova-android-play-services-gradle-release 1.1.4 "cordova-android-play-services-gradle-release"
cordova-custom-config 5.1.0 "cordova-custom-config"
cordova-open-native-settings 1.5.2 "Native settings"
cordova-plugin-admobpro 2.37.2 "AdMob Plugin Pro"
cordova-plugin-android-idfa 1.0.4 "Advertising ID (IDFA) Plugin using Google Play Services for Android"
cordova-plugin-app-event 1.2.1 "Application Events"
cordova-plugin-app-version 0.1.9 "AppVersion"
cordova-plugin-apprate 1.4.0 "AppRate"
cordova-plugin-device 2.0.2 "Device"
cordova-plugin-dialogs 2.0.1 "Notification"
cordova-plugin-extension 1.5.4 "Cordova Plugin Extension"
cordova-plugin-firebase 0.1.25 "Google Firebase Plugin"
cordova-plugin-firebase-crash 1.5.1 "cordova-plugin-firebase-crash"
cordova-plugin-globalization 1.11.0 "Globalization"
cordova-plugin-google-analytics 1.8.6 "Google Universal Analytics Plugin"
cordova-plugin-inappbrowser 3.0.0 "InAppBrowser"
cordova-plugin-ionic-keyboard 2.1.3 "cordova-plugin-ionic-keyboard"
cordova-plugin-ionic-webview 4.0.1 "cordova-plugin-ionic-webview"
cordova-plugin-native-keyboard 1.5.7 "Native Keyboard"
cordova-plugin-nativestorage 2.3.2 "NativeStorage"
cordova-plugin-network-information 2.0.1 "Network Information"
cordova-plugin-screen-orientation 3.0.1 "Screen Orientation"
cordova-plugin-splashscreen 5.0.2 "Splashscreen"
cordova-plugin-statusbar 2.4.2 "StatusBar"
cordova-plugin-whitelist 1.3.3 "Whitelist"
cordova-plugin-x-socialsharing 5.4.5 "SocialSharing"
cordova-promise-polyfill 0.0.2 "cordova-promise-polyfill"
cordova-sqlite-storage 3.2.0 "Cordova sqlite storage plugin - cordova-sqlite-storage plugin version"
es6-promise-plugin 4.2.2 "Promise"
ionic-plugin-deeplinks 1.0.20 "Ionic Deeplink Plugin"