Could not GET 'https://jcenter.bintray.com/com/android/tools/build/gradle/4.0.0/gradle-4.0.0.pom'

i tried everything i could think of but i keep getting this error. this is my gradle build:

buildscript {
repositories {
    jcenter()
    maven{ url "https://dl.bintray.com/android/android-tools" }
    mavenCentral()
}
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.0"
        classpath 'com.google.gms.google-services:4.3.3'
      // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        mavenCentral()
        maven{url 'https://www.google.com/'}
        maven { url "https://dl.bintray.com/android/android-tools" }
    }
}


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


apply plugin: 'com.android.application'

android { compileSdkVersion 30 buildToolsVersion "30.0.0"

defaultConfig {
    applicationId "com.example.textbookexhange"
    minSdkVersion 16
    targetSdkVersion 30
    versionCode 1
    versionName "1.0"

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}

}

my gradle wrapper is fine distributionUrl=https://services.gradle.org/distributions/gradle-6.1.1-all.zip