android.support.v4.widget.DrawerLayout; não está sendo encontrado no meu telefone quando eu testar o aplicativo. Por que isso está acontecendo e como faço para corrigir isso?

Eu não sei ainda, mas acho que posso estar tendo o mesmo problema comandroid.support.v4.view.GravityCompat; eandroid.support.v4.app.ActionBarDrawerToggle; se eles causarem algum problema.

Eu nunca tive problemas comandroid.support.v4.*; antes, mas agora não está funcionando. Eu tenho android.support.v4 lib (o maio).

Editar: melhor mensagem de erro

meu erro

05-27 19:46:21.230: E/jdwp(11659): Failed sending reply to debugger: Broken pipe
05-27 19:46:21.290: W/dalvikvm(11659): VFY: unable to resolve virtual method 30: Landroid/support/v4/widget/DrawerLayout;.closeDrawer (Landroid/view/View;)V
05-27 19:46:21.290: W/dalvikvm(11659): VFY: unable to resolve virtual method 27: Landroid/support/v4/app/ActionBarDrawerToggle;.onConfigurationChanged (Landroid/content/res/Configuration;)V
05-27 19:46:21.290: E/dalvikvm(11659): Could not find class 'android.support.v4.widget.DrawerLayout', referenced from method com.MainActivity.onCreate
05-27 19:46:21.290: W/dalvikvm(11659): VFY: unable to resolve check-cast 16 (Landroid/support/v4/widget/DrawerLayout;) in Lcom/MainActivity;
05-27 19:46:21.290: W/dalvikvm(11659): VFY: unable to resolve virtual method 28: Landroid/support/v4/app/ActionBarDrawerToggle;.onOptionsItemSelected (Landroid/view/MenuItem;)Z
05-27 19:46:21.290: W/dalvikvm(11659): VFY: unable to resolve virtual method 29: Landroid/support/v4/app/ActionBarDrawerToggle;.syncState ()V
05-27 19:46:21.290: W/dalvikvm(11659): VFY: unable to resolve virtual method 31: Landroid/support/v4/widget/DrawerLayout;.isDrawerOpen (Landroid/view/View;)Z
05-27 19:46:21.290: W/dalvikvm(11659): Unable to resolve superclass of Lcom/MainActivity$1; (14)
05-27 19:46:21.290: W/dalvikvm(11659): Link of class 'Lcom/MainActivity$1;' failed
05-27 19:46:21.340: W/dalvikvm(11659): threadid=1: thread exiting with uncaught exception (group=0x40bc71f8)
05-27 19:16:42.404: E/dalvikvm(10623): Could not find class 'android.support.v4.widget.DrawerLayout', referenced from method com.MainActivity.onCreate
05-27 19:16:42.464: E/AndroidRuntime(10623): FATAL EXCEPTION: main
05-27 19:16:42.464: E/AndroidRuntime(10623): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MainActivity}: android.view.InflateException: Binary XML file line #3: Error inflating class android.support.v4.widget.DrawerLayout