java.lang.IllegalAccessError：预验证类中的类ref已解析为意外实现

Question

package com.fio.gmapsactivity;

GMapsActivity

    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;
    import com.google.android.maps.MapActivity;
    import com.google.android.maps.MapView;
    public class GMapsActivity extends MapActivity {
private MapView mapView;
    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
mapView = (MapView) findViewById(R.id.map_view);       
mapView.setBuiltInZoomControls(true);
}
@Override
protected boolean isRouteDisplayed() {
    return false;
}
}

activity_map.xml

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <com.google.android.maps.MapView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/map_view"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:apiKey="AIzaSyB4sGJQVW1hJpOtWnTHvDw5IxV_YOPA9eA"
    android:clickable="true"
    android:enabled="true" />
    </RelativeLayout>

Mainfest.xml

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.fio.gmapsactivity"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="18" />
    <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
    android:name="com.fio.gmapsactivity.GMapsActivity"
    android:label="@string/app_name" >
    <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
    </activity>
    <uses-library android:name="com.google.android.maps" />
    <meta-data
    android:name="com.google.android.gms.version"
    android:value="@integer/google_play_services_version" />
    <meta-data
    android:name="com.google.android.maps.v2.API_KEY"
    android:value="AIzaSyB4sGJQVW1hJpOtWnTHvDw5IxV_YOPA9eA" />
    </application>
    <uses-permission android:name="android.permission.INTERNET"/>
    </manifest>

我已经添加了jar文件（效果，地图，usb）。但是无法map.only显示error.can't能找到错误。请帮助我。

错误

    02-25 02:49:31.993: E/AndroidRuntime(1812): FATAL EXCEPTION: main
    02-25 02:49:31.993: E/AndroidRuntime(1812): java.lang.IllegalAccessError: Class ref in pre-     verified class resolved to unexpected implementation
    02-25 02:49:31.993: E/AndroidRuntime(1812): at dalvik.system.DexFile.defineClass(Native Method)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:211)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at dalvik.system.DexPathList.findClass(DexPathList.java:313)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:51)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.app.ActivityThread.access$600(ActivityThread.java:141)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.os.Handler.dispatchMessage(Handler.java:99)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at android.os.Looper.loop(Looper.java:137)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at   android.app.ActivityThread.main(ActivityThread.java:5103)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at java.lang.reflect.Method.invokeNative(Native Method)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at java.lang.reflect.Method.invoke(Method.java:525)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    02-25 02:49:31.993: E/AndroidRuntime(1812): at dalvik.system.NativeStart.main(Native Method)