Unable to start activity ComponentInfo{attendance.emily.example.com.attendance/attendance.emily.example.com.attendance.MainActivity}: java.lang.NullPointerException: storage == null

Stack trace

java.lang.RuntimeException: Unable to start activity ComponentInfo{attendance.emily.example.com.attendance/attendance.emily.example.com.attendance.MainActivity}: java.lang.NullPointerException: storage == null
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2596)
	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2653)
	at android.app.ActivityThread.access$800(ActivityThread.java:156)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1355)
	at android.os.Handler.dispatchMessage(Handler.java:102)
	at android.os.Looper.loop(Looper.java:157)
	at android.app.ActivityThread.main(ActivityThread.java:5872)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:515)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:674)
	at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException: storage == null
	at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
	at java.util.Arrays.asList(Arrays.java:155)
	at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:128)
	at attendance.emily.example.com.attendance.MainActivity.onCreate(MainActivity.java:73)
	at android.app.Activity.performCreate(Activity.java:5312)
	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2552)
	... 11 more