Android Studio ---Caused by: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup

can anyone help me, please?!!

this is my code 

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
        google()
    }

        dependencies {
            classpath 'com.google.gms:google-services:4.3.3'
            classpath 'com.android.tools.build:gradle:4.1.0-alpha06'
            // ...

            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }






ext {
    supportlib_version = '29.0.0'
    gps_version = '[16.0.0, 17.0.0)'
    fb_version = '[16.0.0, 18.0.0)'
}

//Ensure that all dependencies use the same version of the Android Support library
/*configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex')) {
                details.useVersion "$supportlib_version"
            }
            if (details.requested.group == 'com.google.android.gms'
                    && !details.requested.name.contains('multidex')) {
                details.useVersion "$gps_version"
            }
            if (details.requested.group == 'com.google.firebase'
                    && !details.requested.name.contains('multidex')) {
                details.useVersion "$fb_version"
            }
        }
    }*/

allprojects {
    repositories {
        google()
        jcenter()

    }
}