Error:(9, 5) error: resource android:attr/dialogCornerRadius not found

Question

So I installed android studio 3.0.1 and as soon as it opened the gradle built and showed the following errors. I tried adding dependencies such as design and support but in

Answer 1

Maybe it's too late but i found a solution:

You have to edit in the build.gradle either the compileSdkVersion --> to lastest (now it is 28). Like that:

android {
compileSdkVersion 28
defaultConfig {
    applicationId "NAME_OF_YOUR_PROJECT_DIRECTORY"
    minSdkVersion 21
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

or you can change the version of implementation:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    api 'com.android.support:design:27.+'
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    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'
}