Physics Toolbox Accelerometer funktioniert nicht

This app can be used in the classroom to hep students quantify activities with Newton's 2nd Law by taking a mobile device with the app on field trips to amusement park rides, roller coasters, or even in elevators for standard "elevator problems".  G-Force data can be recorded and exported as a . csv attachment using a comma as a delimiter.  This app can be especially useful for monitoring changes in acceleration in vehicles or airplanes, and to monitor vibrations of any sort.  This accelerometer sensor app measures and displays a graph of G-Force vs.  Time (s) in x, y, and/or z dimensions, as well as total magnitude.  Time (s) and Acceleration (m/s/s) vs.  Because G-Force is the ratio of normal force / weight of the object in question, students can the known mass of the object in question to quantitatively draw force diagrams throughout the object's motion.