Android Eclipse Error- Unfortunately <project> has stopped

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http://stackoverflow.com – I'm new here and to android. I looked at the similar topics, but still didn't find the solution. Here is my xml code.. What I want to do is, on the click of submit button, neither of checkbox is clicked, then produced an error or success message. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:clickable="true" tools:context=".MainActivity" > <EditText android:id="@+id/editText1" android:layout_width="wrap_content" and (HowTos)