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when I want to open or run a project , I get error below :

ERROR: Could not find com.android.tools.build:gradle:3.2.1.
Searched in the following locations:
  - https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom
  - https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.jar
  - https://jcenter.bintray.com/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.pom
  - https://jcenter.bintray.com/com/android/tools/build/gradle/3.2.1/gradle-3.2.1.jar
Required by:
    project :
Open File
and this is my build.gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = '1.3.50'
    repositories {
        google()
        jcenter()
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
allprojects {
    repositories {
        google()
        jcenter()
task clean(type: Delete) {
    delete rootProject.buildDir
also by deffault , it contains google repo but the error is there .
I am running on ubuntu 19.1 , and follow the instructions but unfortunetly I can not solve this.
Thanks to Community.
I remember facing such problems, and surprisingly found out that I have network problem!
Here are steps may help you:
- check your system proxy settings.
- then, File -> invalid Cashes/Restart.
        
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