How to fix "Support-v13:19.1.0 depends on libraries but is not a library itself"?

I just launched a project in Android Studio 0.8.1 for the first time since upgrading from 0.6.2. The error thrown is "Error:Module version com.android.support:support-v13:19.1.0 depends on libraries but is not a library itself". Does anyone have an idea why this is? I have installed some of the new API20 stuff to play with Android L, but the buildTools for this project are still set to 19.1.0. Here's the dependencies section of my build.gradle: ``` dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:19.1.+' compile 'com.android.support:support-v13:19.1.+' compile 'com.jakewharton:butterknife:5.1.0' compile 'de.greenrobot:eventbus:2.2.1' compile 'com.google.code.gson:gson:2.2.4' compile 'com.mcxiaoke.viewpagerindicator:library:2.4.1' compile 'uk.co.chrisjenx:calligraphy:0.7.+' compile 'com.crashlytics.android:crashlytics:1.+' compile 'com.google.android.gms:play-services:4.4.+' } ``` SDK/Buildtools settings are as follows: ``` compileSdkVersion 19 buildToolsVersion "19.1.0" ``` Can anyone explain this or point me towards a fix? I'm stumped.