User Activity

Hi, I am using a Stwinkt1a and the datalog 1.2.0. In this funtionpack i am using the ReadSensorDataApp.mlapp for visualization. The Time diagram is not the problem but with the spectrogram an error occured, that i quite don't understand.Thanks in adv...
The video on the homepage shows the possibility to see the live data and fft analysis. I don't get this in the usage of the app. Can someone please give me a short introduction or show me where to find the manual?
Also I got the Error seen on the picture. I am a newbie to the topic and just want to get the kit startet. Any Suggestions