Android .out.xml error?

[Kixassose]

Everytime I compile my android code, I get this error.\[code\][2012-09-30 14:46:48 - My First App] activity_main.out.xml is out of sync. Please refresh.[2012-09-30 14:47:08 - My First App] activity_main.out.xml is out of sync. Please refresh.[2012-09-30 14:51:04 - My First App] Error in an XML file: aborting build.[2012-09-30 14:51:18 - My First App] Error in an XML file: aborting build.[2012-09-30 15:39:17 - My First App] Error in an XML file: aborting build.[2012-09-30 21:21:33 - sup_cheesepuff] ------------------------------[2012-09-30 21:21:33 - sup_cheesepuff] Android Launch![2012-09-30 21:21:33 - sup_cheesepuff] adb is running normally.[2012-09-30 21:21:33 - sup_cheesepuff] Performing com.example.sup_cheesepuff.MainActivity activity launch[2012-09-30 21:21:34 - sup_cheesepuff] Automatic Target Mode: launching new emulator with compatible AVD 'Froyo.'[2012-09-30 21:21:34 - sup_cheesepuff] Launching a new emulator with Virtual Device 'Froyo.'[2012-09-30 21:21:56 - Emulator] 2012-09-30 21:21:56.633 emulator-arm[7523:1107] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz.[2012-09-30 21:21:56 - sup_cheesepuff] New emulator found: emulator-5554[2012-09-30 21:21:56 - sup_cheesepuff] Waiting for HOME ('android.process.acore') to be launched...[2012-09-30 21:23:20 - sup_cheesepuff] HOME is up on device 'emulator-5554'[2012-09-30 21:23:20 - sup_cheesepuff] Uploading sup_cheesepuff.apk onto device 'emulator-5554'[2012-09-30 21:23:20 - sup_cheesepuff] Installing sup_cheesepuff.apk...[2012-09-30 21:23:36 - sup_cheesepuff] Success![2012-09-30 21:23:36 - sup_cheesepuff] Starting activity com.example.sup_cheesepuff.MainActivity on device emulator-5554[2012-09-30 21:23:41 - sup_cheesepuff] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.sup_cheesepuff/.MainActivity }[2012-09-30 21:32:10 - sup_cheesepuff] Error in an XML file: aborting build.\[/code\]I have looked at other threads with similar topics, but none help. Here is my XML source.\[code\]<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="@string/hello_world" tools:context=".MainActivity" /> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="100dp" android:text="Hey boi!" android:textAppearance="?android:attr/textAppearanceLarge" /></RelativeLayout>\[/code\]I'm new to both Android and XML by the way.