android t跳转到fragment,Android: can't replace one fragment with anoth

I need to replace a Fragment in one Activity with another Fragment, below is the layer file of the Activity:

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:id="@+id/home_layout_container">

android:id="@+id/home_list"

android:layout_width="fill_parent"

android:layout_height="fill_parent" />

so by default there is FragA, now I want to replace it with FragB in activity, I did:

public void onRegionClicked(Region region) {

RegionInfoFragment rif = RegionInfoFragment.newInstance(region);

FragmentTransaction ft = getSupportFragmentManager().beginTransaction();

ft.replace(R.id.home_list, rif);

}

But I got exception:

>6:24:40.685: ERROR/AndroidRuntime(9194): Uncaught handler: thread main exiting due to uncaught exception

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.view.ViewGroup.addViewInner(ViewGroup.java:1857)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.view.ViewGroup.addView(ViewGroup.java:1752)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.view.ViewGroup.addView(ViewGroup.java:1709)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.view.ViewGroup.addView(ViewGroup.java:1689)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.support.v4.app.NoSaveStateFrameLayout.wrap(NoSaveStateFrameLayout.java:40)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:743)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:933)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:578)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1219)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:380)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.os.Handler.handleCallback(Handler.java:587)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.os.Handler.dispatchMessage(Handler.java:92)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.os.Looper.loop(Looper.java:123)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at android.app.ActivityThread.main(ActivityThread.java:4363)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at java.lang.reflect.Method.invokeNative(Native Method)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at java.lang.reflect.Method.invoke(Method.java:521)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

05-06 16:24:40.692: ERROR/AndroidRuntime(9194): at dalvik.system.NativeStart.main(Native Method)

What can I do?

Thanks!