Can't compile with Android Studio 1.3, gradle says the resource is already defined

Ever since I upgraded to Android Studio 1.3, I have had a very strange problem. When I try to start my apps, it tells me that:

"Gradle 2.4 requires Android Gradle Plugin 1.2.0 (or newer), but the project uses version 1.0.0. Please use Android Gradle Plugin 1.2.0 or newer."

When I click on "Fix plugin version and sync project" it changes this in my build.gradle files

dependencies {
    classpath 'com.android.tools.build:gradle:1.0.0'
}

      

        
        
        
      

    

on this:

dependencies {
    classpath 'com.android.tools.build:gradle:1.2.3'
}

      

        
        
        
      

    

But I cannot start my app because of this resource (in my sw600dp / config.xml file):

<item name="is_tablet" type="bool">true</item>

      

        
        
        
      

    

It says that this resource is already defined in the auto-generated file "values-sw600dp-v13 / values.xml":

<resources>
    <!-- From: file:.../src/main/res/values-sw600dp/config.xml -->
    <eat-comment/>
    <item name="is_tablet" type="bool">true</item>
</resources>

      

        
        
        
      

    

(When I open this file it says "Files in the build folder are created and should not be edited").

If I comment, in the sw600dp / config.xml file a resource, it works, but it worked before, it shouldn't be said that it is already defined! And this happens in all my applications!

I've already tried:

• Delete a line in an automatically generated file; of course it creates the string automatically and still can't compile.
• Enter "./gradlew clean build build" in the console. What he did was download " https://services.gradle.org/distributions/gradle-2.2.1-all.zip " and it ended up with:

FAILURE: Build failed, exception.

• What went wrong: Failed to execute task ': app: processDebugResources'.

  com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command' /Users/Library/Android/sdk/build-tools/21.1.2/aapt '' finished with non- zero exit value 1

• I also tried to do "File> Invalid Caches / Restart"

None of this worked!

What can I do?

(I am using MAC)

Thanks a lot in advance !