Não consigo acessar a agenda

Emulator: qemu-system-i386.exe: Unable to open C:\Users\Fluttershy.android\avd\Galaxy_Nexus_API_23.avd\data\misc\pstore\pstore.bin: Permission denied

ele para de abrir se eu usar o Button

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
    tools:context="com.fluttershy.agenda.StudentsListActivity"
    android:orientation="vertical">


    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/students_list"/>


            android:layout_width="wrap_content"
            android:layout_h <Buttoneight="wrap_content"
            android:text="+"
            android:layout_alignParentRight="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="16dp"
            android:layout_marginRight="16dp"
            android:background="@drawable/bkg"
            android:textSize="40sp"
            android:elevation="8dp"
            android:stateListAnimator="@null"
            android:textColor="#ffffff" />
</android.support.constraint.RelativeLayout>