title: I got an error when downloading an image with picasso library, android
body: <p><img src="https://i.stack.imgur.com/QonF0.png" alt="enter image description here">when i run this code in the oncreate method :</p>
  
  <pre><code>Picasso.with(this).load("http://i.imgur.com/DvpvklR.png").into(image);
  </code></pre>
  
  <p>I got these errors:</p>
  
  <ul>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577): FATAL EXCEPTION: main</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577): java.lang.NoClassDefFoundError: com.squareup.picasso.Picasso</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at com.example.news.MainActivity.onCreate(MainActivity.java:45)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.app.ActivityThread.access$1500(ActivityThread.java:117)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.os.Handler.dispatchMessage(Handler.java:99)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.os.Looper.loop(Looper.java:123)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at android.app.ActivityThread.main(ActivityThread.java:3683)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at java.lang.reflect.Method.invokeNative(Native Method)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at java.lang.reflect.Method.invoke(Method.java:507)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)</li>
  <li>03-11 20:02:47.240: E/AndroidRuntime(1577):   at dalvik.system.NativeStart.main(Native Method)</li>
  </ul>
  
  <p>please help me !</p>