Force Down error in MapView

i want to open a map when i click a button but unfortunately my app forces down…this is my logcat:

01-31 18:11:49.465: VERBOSE/InputDevice(2836): ID[0]=0(0) Up(1=>0)
01-31 18:11:49.606: WARN/dalvikvm(6111): Class resolved by unexpected DEX: Lkostas/menu/olympiakos/GoogleMaps;(0x486356d8):0x22f5d8 ref [Lcom/google/android/maps/MapActivity;] Lcom/google/android/maps/MapActivity;(0x486356d8):0x21dca0
01-31 18:11:49.606: WARN/dalvikvm(6111): (Lkostas/menu/olympiakos/GoogleMaps; had used a different Lcom/google/android/maps/MapActivity; during pre-verification)
01-31 18:11:49.606: WARN/dalvikvm(6111): Unable to resolve superclass of Lkostas/menu/olympiakos/GoogleMaps; (67)
01-31 18:11:49.606: WARN/dalvikvm(6111): Link of class 'Lkostas/menu/olympiakos/GoogleMaps;' failed
01-31 18:11:49.610: DEBUG/AndroidRuntime(6111): Shutting down VM
01-31 18:11:49.610: WARN/dalvikvm(6111): threadid=1: thread exiting with uncaught exception (group=0x4001d7d0)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111): FATAL EXCEPTION: main
01-31 18:11:49.641: ERROR/AndroidRuntime(6111): java.lang.NoClassDefFoundError: kostas.menu.olympiakos.GoogleMaps
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at kostas.menu.olympiakos.DialogActivity$1.onItemClick(DialogActivity.java:47)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.widget.ListView.performItemClick(ListView.java:3672)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.os.Handler.handleCallback(Handler.java:587)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.os.Handler.dispatchMessage(Handler.java:92)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.os.Looper.loop(Looper.java:123)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at android.app.ActivityThread.main(ActivityThread.java:4627)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at java.lang.reflect.Method.invokeNative(Native Method)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at java.lang.reflect.Method.invoke(Method.java:521)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at dalvik.system.NativeStart.main(Native Method)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111): Caused by: java.lang.IllegalAccessError: Class ref in pre-verified class resolved to unexpected implementation
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at dalvik.system.DexFile.defineClass(Native Method)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:209)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:203)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
01-31 18:11:49.641: ERROR/AndroidRuntime(6111):     ... 13 more
01-31 18:11:49.660: WARN/ActivityManager(2836):   Force finishing activity kostas.menu.olympiakos/.DialogActivity

thats the way i m calling the map activity:

Intent newActivity111 = new Intent(DialogActivity.this, GoogleMaps.class);
                                startActivity(newActivity111);

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