Note Quest funktioniert nicht

GAME DRILLS (Single purchase, keep forever): Play a variety of single-note drills and interval drills to get you the best start to actual music reading.  Now, Note Quest has 2 simplified upgrades: Game Drills (scored) and Sight Reading (non-game exercises).  SIGHT READING (Subscription): Hundreds of curated, leveled exercises from Beginner to Advanced.  It’s got many options to make it easier than ever to improve your sight reading speed and accuracy!  CHORD CRUSH is included in Sight Reading.  This is the ONLY known app that focuses on 2-note reading (intervals), the real pathway towards sight-reading fluency!  They're a game changer when learning to play piano, and this part is FREE! Away from home?  PDF Sight Reading Flashcards!  Play the built-in VIRTUAL PIANO so you don't miss a beat!  It comes with a large variety of musical periods and styles, not boring, randomized notes.  Play daily and consistently to unlock fun, printable sheet music and activities!  Learn to read chord symbols while developing skills you can use for a lifetime! ** NOW AVAILABLE!  Check your accuracy by tapping LISTEN, a form of ear training in itself.  This teacher's favorite flashcard app responds to your playing with a timer and scores!  Note Quest is like having 2 apps in 1!  Beginners, start with Landmark Notes.