Android studio crashed in the first run - crash

Question

I'm having this error
ERROR: Unable to resolve dependency for ':app#debug/compileClasspath':
Could not find any version that matches
com.android.support:appcompat-v7:29.+.
I slept while the Android studio was downloading gradle ,so My laptop went in sleep mode and stopped everything.
Now I'm getting the error above. I think something is missing from the first run download ,How can i fix it ?
----------EDIT
apply plugin: 'com.android.application'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
applicationId "com.example.myapplication"
minSdkVersion 15
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:29.+'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
and the second one
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.3.0'
// 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
}

Answer 1

According to Google: This is the stable release of Support Library 28.0.0 and is suitable for use in production. This will be the last feature release under the android.support packaging, and developers are encouraged to migrate to AndroidX.
Refer to https://developer.android.com/topic/libraries/support-library/revisions
This is why you are getting error on
implementation 'com.android.support:appcompat-v7:29.+'
Either migrate to androidX or you can use
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
in your gradle
Hope this will help you
Happy Coding