XML : Share button on android

I am trying to create a share button for my app but every time I try to run the app stops working. Specifically, it stops working when I try to create the intent in the OnCreateOptionsMenu() method. Anyone know why this is? Thank you in advance!

Here is my code:

MainActivity.java

      @Override      public boolean onCreateOptionsMenu (Menu menu){      /** Inflating the current activity's menu with res/menu/items.xml */      getMenuInflater().inflate(R.menu.menu_main, menu);        /** Getting the action provider associated with the menu item whose id is share */      ShareActionProvider mShareActionProvider = (ShareActionProvider) menu.findItem(R.id.action_share).getActionProvider();        /** Setting a share intent */      mShareActionProvider.setShareIntent(getDefaultShareIntent());        return super.onCreateOptionsMenu(menu);    }    /** Returns a share intent */  private Intent getDefaultShareIntent(){      Intent intent = new Intent(Intent.ACTION_SEND);      intent.setType("text/plain");      intent.putExtra(Intent.EXTRA_SUBJECT, "SUBJECT");      intent.putExtra(Intent.EXTRA_TEXT,"Extra Text");      return intent;  }    

menu_main.xml

      <menu xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">    <item      android:id="@+id/action_about"      android:orderInCategory="10"      app:showAsAction="never"      android:title="About"      />  <item      android:id="@+id/action_settings"      android:orderInCategory="100"      app:showAsAction="never"      android:title="EDA Information"      />  <item  android:id="@+id/action_share"  app:showAsAction="ifRoom"  android:actionProviderClass="android.widget.ShareActionProvider"  android:title="Share"/>