Google has just released an update for Android Studio. It can give some problems, for example with Gradle and/or the skd Build Tools too low. There is an easy fix.
First of all go to the SDK manager, through the menu “tools, android”, select the SDK build-tools 19.1 and install.
After right-click on the your project folder application, and select “Open module settings”. Here select your right module and, in the settings area, select the needed build-tools, the 19.1 in this situation.
An useful guide is avaible here.
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