Use build tools version 22.

app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 22
-    buildToolsVersion "21.1.1"
+    buildToolsVersion '22.0.0'
 
     defaultConfig {
         applicationId "org.yaaic"
@@ -21,7 +21,6 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-
     compile 'com.android.support:support-v4:22.0.0'
 
     compile 'com.viewpagerindicator:library:2.4.1@aar'