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استاد سلام و خسته نباشید 

من در ران گرفتن پروژه ها در اندروید استادیو مشکل دارم نسخه برنامه رو روی اندروید 5 میزارم و از ایمولیتور اندروید 10 استفاده می کنم 

ولی با ارور های زیر مواجه می شم 

ارور اول

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Could not resolve com.android.support.constraint:constraint-layout:2.0.4.
     Required by:
         project :app
      > Could not resolve com.android.support.constraint:constraint-layout:2.0.4.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
               > dl.google.com
      > Could not resolve com.android.support.constraint:constraint-layout:2.0.4.
         > Could not get resource 'https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
               > jcenter.bintray.com

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 7s
3 actionable tasks: 1 executed, 2 up-to-date

ارور دوم

Execution failed for task ':app:checkDebugAarMetadata'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Could not resolve com.android.support.constraint:constraint-layout:2.0.4.
     Required by:
         project :app
      > Could not resolve com.android.support.constraint:constraint-layout:2.0.4.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
               > dl.google.com
      > Could not resolve com.android.support.constraint:constraint-layout:2.0.4.
         > Could not get resource 'https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/support/constraint/constraint-layout/2.0.4/constraint-layout-2.0.4.pom'.
               > jcenter.bintray.com

ارور سوم

Unknown host 'dl.google.com'. You may need to adjust the proxy settings in Gradle.
Learn about configuring HTTP proxies in Gradle

مشخصات gradle

plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.electerom"
        minSdkVersion 22
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'com.android.support.constraint:constraint-layout:2.0.4'
    testImplementation 'junit:junit:'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

ممنون می شم پاسخ بدید 

واقعا به مشکل خوردم