Could not find 2.2.0-alpha6

[AlexanderTim]

Hello,
Could not find com.android.tools.build:gradle:2.2.0-alpha6.
Searched in the following locations:

• https://repo.maven.apache.org/maven2/com/android/tools/build/gradle/2.2.0-alpha6/gradle-2.2.0-alpha6.pom