eclipse - could not initialize android widget error -

eclipse - could not initialize android widget error -

i'm finish beginner in android, , eclipse forgive me if question easy. problem can't find working area in graphical layout tab. , gives me error whenever seek alter landscape or portrait.

here eclipse:

i want create show, can layout application easily.

my xml:

<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:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context="com.example.androidproject.mainactivity" > <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </relativelayout>

android eclipse