i am getting a "rendering problems" error

i am getting the following error: Rendering Problems Missing styles. Is the correct theme chosen for this layout? Use the Theme combo box above the layout to choose a different layout, or fix the theme style references. Couldn't resolve resource @dimen/activity_horizontal_margin (4 similar errors not shown) "@dimen/activity_horizontal_margin" in attribute "paddingLeft" is not a valid format. (Edit) (4 similar errors not shown) Failed to find style 'textViewStyle' in current theme (12 similar errors not shown)

my code for activity_fun_facts.xml is: <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:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".FunFactsActivity" android:id="@+id/relativeLayout" android:background="#ff000000" android:clickable="false">

<TextView
    android:text="Did You Know?"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/textView"
    android:textSize="24sp"
    android:textColor="#80ffffff" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Ants stretch when they wake up in the morning"
    android:id="@+id/factTextView"
    android:layout_centerVertical="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:textSize="24sp"
    android:textColor="@android:color/white" />

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Show another fun Xbox fact!"
    android:id="@+id/showFactButton"
    android:background="@android:color/white"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

</RelativeLayout>