title: java.lang.NoClassDefFoundError: com.nineoldandroids.view.ViewHelper
body: <p>I am using <a href="https://github.com/daimajia/AndroidImageSlider" rel="nofollow noreferrer">daimajia/AndroidImageSlider</a>. I imported all dependencies like NineOldAndroid,Picasso and this 'com.daimajia.slider:library:1.1.2@aar' and coded as guided on Github. but whenever i tried to run the app it stops and show the error.my biuld.gradle for app is.Thank you so much. spent two days already.</p>
  
  <pre><code>dependencies {
  compile fileTree(include: ['*.jar'], dir: 'libs')
  compile 'com.android.support:appcompat-v7:22.1.0'
  compile 'com.squareup.picasso:picasso:2.3.2'
  compile 'com.daimajia.slider:library:1.1.2@aar'
  compile 'com.android.support:recyclerview-v7:21.0.+'
  compile files('C:/Users/Vinit/Downloads/Coupan/library/volley.jar')
  compile files('C:/Users/Vinit/Downloads/Coupan/library/nineoldandroids-2.3.0.jar')}
  </code></pre>
  
  <p>Don't know where and what i am doing wrong. this is my log file.</p>
  
  <pre><code>java.lang.NoClassDefFoundError: com.nineoldandroids.view.ViewHelper
          at com.daimajia.slider.library.Transformers.BaseTransformer.onPreTransform(BaseTransformer.java:75)
          at com.daimajia.slider.library.Transformers.BaseTransformer.transformPage(BaseTransformer.java:42)
          at com.daimajia.slider.library.Tricks.ViewPagerEx.onPageScrolled(ViewPagerEx.java:1727)
          at com.daimajia.slider.library.Tricks.ViewPagerEx.pageScrolled(ViewPagerEx.java:1649)
          at com.daimajia.slider.library.Tricks.ViewPagerEx.scrollToItem(ViewPagerEx.java:581)
          at com.daimajia.slider.library.Tricks.ViewPagerEx.onLayout(ViewPagerEx.java:1599)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1160)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1160)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1160)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
          at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.support.v7.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:493)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
          at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
          at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
          at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
          at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
          at android.view.View.layout(View.java:15131)
          at android.view.ViewGroup.layout(ViewGroup.java:4862)
          at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2323)
          at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2029)
          at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1192)
          at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6231)
          at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
          at android.view.Choreographer.doCallbacks(Choreographer.java:591)
          at android.view.Choreographer.doFrame(Choreographer.java:560)
          at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
          at android.os.Handler.handleCallback(Handler.java:808)
          at android.os.Handler.dispatchMessage(Handler.java:103)
          at android.os.Looper.loop(Looper.java:193)
          at android.app.ActivityThread.main(ActivityThread.java:5292)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:515)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
          at dalvik.system.NativeStart.main(Native Method)
  </code></pre>