// java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mschlauch.comfortreader/com.mschlauch.comfortreader.NoteActivity}: java.lang.StringIndexOutOfBoundsException: length=0; regionStart=0; regionLength=-1
// at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
// at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
// at android.app.ActivityThread.-wrap11(ActivityThread.java)
// at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
// at android.os.Handler.dispatchMessage(Handler.java:102)
// at android.os.Looper.loop(Looper.java:148)
// at android.app.ActivityThread.main(ActivityThread.java:5417)
// at java.lang.reflect.Method.invoke(Native Method)
// at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
// at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
// Caused by: java.lang.StringIndexOutOfBoundsException: length=0; regionStart=0; regionLength=-1
// at java.lang.String.startEndAndLength(String.java:298)
// at java.lang.String.substring(String.java:1087)
// at com.mschlauch.comfortreader.SettingsLoader.getCurrentNotesFilePath(SettingsLoader.java:317)
// at com.mschlauch.comfortreader.SettingsLoader.getCurrentNotes(SettingsLoader.java:301)
// at com.mschlauch.comfortreader.NoteActivity.onCreate(NoteActivity.java:76)
// at android.app.Activity.performCreate(Activity.java:6251)
// at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
// at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
// ... 9 more