I'm getting an Access denied error to your build log, and I didn't use it, but I'll try to answer you.
As announced here:
The Android Gradle Plugin 3.0.0-alpha3 was also released through
maven.google.com.
You can try to fix it by adding Google’s Maven Repository here like this:
buildscript {
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.0-alpha3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
Make sure that the repositories section includes a maven section with
the "https://maven.google.com" endpoint. For example:
allprojects {
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
}
As commented here, this version doesn't exist in Bintray JCenter:
com.android.tools.build.gradle
latest version is 2.5.0-alpha-preview-02, there is no 3.0.0-alpha3
Also be sure to update build tools to the latest version as suggested in this related question:
Update your build tools from SDK manager
I add links to samples using the new sdkmanager
command line here.
I would need a sample project reproducing the issue to check my suggestions.