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I was tring to compile my project in Android Studio (using Java) and the following error appeared:

Could not find org.jetbrains.kotlin:kotlin-stdlib:1.1.3-2.
Searched in the following locations:
  - https://maven.fabric.io/public/org/jetbrains/kotlin/kotlin-stdlib/1.1.3-2/kotlin-stdlib-1.1.3-2.pom
  - https://maven.fabric.io/public/org/jetbrains/kotlin/kotlin-stdlib/1.1.3-2/kotlin-stdlib-1.1.3-2.jar
  - https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.1.3-2/kotlin-stdlib-1.1.3-2.pom
  - https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-stdlib/1.1.3-2/kotlin-stdlib-1.1.3-2.jar
Since I am not using kotlin I do not understand why is it being requested to compile my project. 
The rest of questions I've seen about it here are about Kotlin projects or missing SDK but it is not my case.
build.gradle (app):
buildscript {
    repositories {
        maven { url 'https://maven.fabric.io/public' }
        google()
    dependencies {
        classpath 'io.fabric.tools:gradle:1.27.1'
        classpath 'com.android.tools.build:gradle:3.0.0'
apply plugin: 'com.android.application'
apply plugin: 'io.fabric'
repositories {
    maven { url 'https://maven.fabric.io/public' }
android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.project.test"
        minSdkVersion 22
        targetSdkVersion 27
        versionCode 10
        versionName "0.19"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),     'proguard-rules.pro'
    dataBinding.enabled = true
    testOptions {
        unitTests.all {
            jvmArgs '-XX:MaxPermSize=256m'
        unitTests.returnDefaultValues = true
    packagingOptions {
        exclude 'META-INF/proguard/androidx-annotations.pro'
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    testImplementation 'junit:junit:4.12'
    testImplementation 'org.json:json:20180130'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.android.support:design:27.1.1'
    implementation 'com.squareup.okhttp3:okhttp:3.10.0'
    implementation 'com.github.paolorotolo:expandableheightlistview:1.0.0'
    implementation 'com.google.code.gson:gson:2.8.5'
    def room_version = "1.1.1"
    implementation "android.arch.persistence.room:runtime:$room_version"
    annotationProcessor "android.arch.persistence.room:compiler:$room_version"
    // optional - RxJava support for Room
    implementation "android.arch.persistence.room:rxjava2:$room_version"
    // optional - Guava support for Room, including Optional and ListenableFuture
    //implementation "android.arch.persistence.room:guava:$room_version"
    // Converter
    implementation "android.arch.persistence.room:runtime:1.1.1"
    annotationProcessor "android.arch.persistence.room:compiler:1.1.1"
    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.github.PhilJay:MPAndroidChart:v3.0.2'
    testImplementation "org.powermock:powermock-module-junit4:1.7.4"
    testImplementation "org.powermock:powermock-api-mockito2:1.7.4"
    // WorkManager
    implementation "android.arch.work:work-runtime:1.0.0-beta02"
    // Power menu
    implementation "com.github.skydoves:powermenu:2.0.5"
    // Crashlytics
    implementation('com.crashlytics.sdk.android:crashlytics:2.9.5@aar') {
        transitive = true
build.gradle (project):
buildscript {
    repositories {
        google()
        jcenter()
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
allprojects {
    repositories {
        google()
        jcenter()
        maven { url "https://jitpack.io" }
task clean(type: Delete) {
    delete rootProject.buildDir
dependencies {
Thank you in advance. 
                Yesterday the app was running without problems in this version, that's why I didn't try to downgrade it
– P. Vera
                Feb 12, 2019 at 8:53
                I downgraded the version and the same error still appears, but i edited my question, I found a possible solution.
– P. Vera
                Feb 12, 2019 at 8:58
So, I found the solution. 
I was still doing some research and I found this question: possible solution
People said jcenter() must be included in the project-level build.gradle, and since I already had it, I tried to add it to build.gradle (app).
It worked. 
If someone could explain why, it would be awesome. 
        
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