Could not find method implementation() for arguments on object of type org.gradle.***.DefaultDependencyHandler

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I am using Ionic 5 Framework to develop an Android app and wanted to implement Firebase Could Messaging to it. After I updated two build.gradle files and Sync project with Gradle files, I got the following Error message:

Could not find method implementation() for arguments [DefaultExternalModuleDependency{group=‘com.google.firebase’, name=‘firebase-bom’, version=‘26.1.1’, configuration=‘default’}] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

Here are my system information:

Project-level build.gradle (/build.gradle):
buildscript {
ext.kotlin_version = ‘1.3.50’
repositories {
google()
jcenter()
}
dependencies {
classpath ‘com.android.tools.build:gradle:4.0.0’
classpath “org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version”

            classpath 'com.google.gms:google-services:4.3.4'
            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            google()
            jcenter()
        }

        //This replaces project.properties w.r.t. build settings
        project.ext {
          defaultBuildToolsVersion="29.0.2" //String
          defaultMinSdkVersion=22 //Integer - Minimum requirement is Android 5.1
          defaultTargetSdkVersion=29 //Integer - We ALWAYS target the latest by default
          defaultCompileSdkVersion=29 //Integer - We ALWAYS compile with the latest by default
        }
    }

    task clean(type: Delete) {
        delete rootProject.buildDir
    }

App-level build.gradle ( //build.gradle )

apply plugin: 'com.android.application'

apply plugin: 'com.google.gms.google-services'

*if*  (cdvHelpers.getConfigPreference('GradlePluginKotlinEnabled', 'false').toBoolean()) {

    apply plugin: 'kotlin-android'

    apply plugin: 'kotlin-android-extensions'

}

buildscript {

    apply from: '../CordovaLib/cordova.gradle'

     *if* (cdvHelpers.getConfigPreference('GradlePluginKotlinEnabled', 'false').toBoolean()) {

        String defaultGradlePluginKotlinVersion = kotlin_version

 

        String gradlePluginKotlinVersion = cdvHelpers.getConfigPreference('GradlePluginKotlinVersion', defaultGradlePluginKotlinVersion)

         *if* (!cdvHelpers.isVersionValid(gradlePluginKotlinVersion)) {

            println("The defined Kotlin version (${gradlePluginKotlinVersion}) does not appear to be a valid version. Falling back to version: ${defaultGradlePluginKotlinVersion}.")

            gradlePluginKotlinVersion = defaultGradlePluginKotlinVersion

        }

         *// Change the version to be used.*

        ext.kotlin_version = gradlePluginKotlinVersion

    }

    repositories {

        mavenCentral()

        google()

        jcenter()

    }

    dependencies {

        apply from: '../CordovaLib/cordova.gradle'

        classpath 'com.android.tools.build:gradle:4.0.0'

        implementation platform('com.google.firebase:firebase-bom:26.1.1')

        implementation 'com.google.firebase:firebase-messaging-ktx'

         *if*  (cdvHelpers.getConfigPreference('GradlePluginKotlinEnabled', 'false').toBoolean()) {

            classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        }

         *if* (cdvHelpers.getConfigPreference('GradlePluginGoogleServicesEnabled', 'false').toBoolean()) {

            String defaultGradlePluginGoogleServicesVersion = '4.2.0'

 

            String gradlePluginGoogleServicesVersion = cdvHelpers.getConfigPreference('GradlePluginGoogleServicesVersion', defaultGradlePluginGoogleServicesVersion)

             *if* (!cdvHelpers.isVersionValid(gradlePluginGoogleServicesVersion)) {

                println("The defined Google Services plugin version (${gradlePluginGoogleServicesVersion}) does not appear to be a valid version. Falling back to version: ${defaultGradlePluginGoogleServicesVersion}.")

                gradlePluginGoogleServicesVersion = defaultGradlePluginGoogleServicesVersion

            }

             *// Create the Google Services classpath and set it.*

            String gradlePluginGoogleServicesClassPath = "com.google.gms:google-services:${gradlePluginGoogleServicesVersion}"

            println "Adding classpath: ${gradlePluginGoogleServicesClassPath}"

            classpath gradlePluginGoogleServicesClassPath

        }

    }

}

*// Allow plugins to declare Maven dependencies via build-extras.gradle.*

allprojects {

    repositories {

        mavenCentral()

        jcenter()

    }

Gradle Version:

Gradle 6.1.1
------------------------------------------------------------

Build time:   2020-01-24 22:30:24 UTC
Revision:     a8c3750babb99d1894378073499d6716a1a1fa5d

Kotlin:       1.3.61
Groovy:       2.5.8
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          1.8.0_271 (Oracle Corporation 25.271-b09)
OS:           Windows 10 10.0 amd64

I have tried gradle version 6.3, 6.5, 6.7.1 and got the same kind error message.

Thank you for your help!