Apps How can i set a padding for a Button element that uses android:background+app quits instantly

[workbench]

Hello to everyone in this forum,
i'm new to android-development and i have a question:

i'm trying to create a rounded button,i found a tutorial that descibles the android:background attribute for the Button element for the layout files. So i created the buttonshape.xml in the drawables folder and have the following layout file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp">

        <Button
            android:id="@+id/date_from_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onButtonDateFrom"
            android:background="@drawable/buttonshape"
            android:text="@string/datum_from_button" />

        <Button
            android:id="@+id/date_to_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onButtonDateTo"
            android:text="@string/datum_to_button" />


    </LinearLayout>

    <DatePicker
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"/>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/time_from_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onButtonTimeFrom"
            android:text="@string/time_from_button" />

        <Button
            android:id="@+id/time_to_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onButtonTimeTo"
            android:text="@string/time_to_button" />


    </LinearLayout>

    <DatePicker
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"/>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/search_start"
            android:layout_gravity="center_horizontal"/>

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/search_start"/>

    </FrameLayout>
</ScrollView>
</LinearLayout>

Now my problem is that i'm not able to set a padding for the Button, no matter which attribute i set i get no padding and the app stops directly after starting it. Here is the code of the drawable/buttonshape.xml file:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
    <corners
        android:radius="23dp"
        />
    <solid
        android:color="#FF0000"
        />
    <stroke
        android:width="2dp"
        android:color="#878787"
        />

    <padding
        android:left="5dp"
        android:top="5dp"
        android:right="5dp"
        android:bottom="5dp"
        />
</shape>

I don't understand what i'm doing wrong so the app isn't even starting... but i get no errors when building it... please help a lost soul.

best regards,
workbench