title: Why does it give me a "Failed to resolve" error in Android Studio?
body: <p>I am trying to learn Android and I tried to make an example from a tutorial. I have to include two libraries in the build.gradle, but when I sync the project with the gradle files it gives me this error: "Failed to resolve".</p>
  
  <p>Here is the dependecies part from build.gradle:</p>
  
  <pre><code>dependencies {
  compile fileTree(dir: 'libs', include: ['*.jar'])
  compile 'com.android.support:appcompat-v7:22.1.1'
  compile 'com.loopj.android:android-async-http:1.4.4'
  compile 'com.squareup.picasso:picasso:2.1.1'
  </code></pre>
  
  <p>}</p>
  
  <p>Is there somethig wrong with the versions of the libraries or is it something else?</p>