¿Qué está causando esto en android webView?

Estoy recibiendo la siguiente excepción y no puedo depurarla.

Por favor ayuda.
Código:

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public class HybridActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); WebView webview=(WebView)findViewById(R.id.webkitWebView1); WebSettings settings=webview.getSettings(); settings.setJavaScriptEnabled(true); settings.setDatabaseEnabled(true); settings.setDomStorageEnabled(true); settings.setAllowFileAccess(true); settings.setBuiltInZoomControls(true); webview.setWebChromeClient(new WebChromeClient()); // webview.loadUrl("file:///android_asset/www/html/hyb.html"); // webview.loadUrl("file:///android_asset/index.html"); try { webview.loadUrl("http://www.google.com"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } MultipleWebViewHanlder webView2 = new MultipleWebViewHanlder(this); webView2.loadNewWebView(); } } public class MultipleWebViewHanlder { public MultipleWebViewHanlder(Context context) { // TODO Auto-generated constructor stub this.context = context; } public void MultipleWebViewArea(final String command) { final RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT); try { Log.i("","Inside tryyyyyyyyyyyyyyyyyyyyy"); final WebView mWebView = new WebView(context); WebSettings settings=mWebView.getSettings(); settings.setJavaScriptEnabled(true); settings.setDatabaseEnabled(true); settings.setDomStorageEnabled(true); settings.setAllowFileAccess(true); settings.setBuiltInZoomControls(true); mWebView.setWebChromeClient(new WebChromeClient()); JSInterface.handler.post(new Runnable() { @Override public void run() { try { Log.i("","Inside tryyyyyyyyyyyyyyyyyyyy b4 add content viewwwwwwwwww"); Runnable runnable = new Runnable() { public void run() { ((Activity)context).addContentView(mWebView,params); Log.i("","Inside tryyyyyyyyyyyyyyyyyyyy after add content viewwwwwwwwww "); mWebView.loadUrl(((Activity)context).getResources().getString(R.string.DemoURL)); } }; ((Activity)context).runOnUiThread(runnable); 

Iniciar sesión:

 04-20 10:55:58.052: WARN/dalvikvm(9255): threadid=8: thread exiting with uncaught exception (group=0x400207d8) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): FATAL EXCEPTION: WebViewCoreThread 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.view.ViewRoot.checkThread(ViewRoot.java:2812) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.view.ViewRoot.invalidateChild(ViewRoot.java:607) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:633) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.view.ViewGroup.invalidateChild(ViewGroup.java:2505) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.view.View.invalidate(View.java:5115) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.webkit.WebView.viewInvalidate(WebView.java:2565) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.webkit.WebView.invalidateContentRect(WebView.java:2584) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.webkit.WebView.access$6200(WebView.java:304) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.webkit.WebView$PrivateHandler.handleMessage(WebView.java:7860) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.os.Handler.dispatchMessage(Handler.java:99) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.os.Looper.loop(Looper.java:123) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:637) 04-20 10:55:58.092: ERROR/AndroidRuntime(9255): at java.lang.Thread.run(Thread.java:1096) 04-20 10:55:58.102: WARN/ActivityManager(172): Force finishing activity com.Hy5/.activity.Hy5CanvasActivity 

 Runnable runnable = new Runnable() { public void run() { // your code here } } runOnUiThread(runnable);