Pothos Flow simple FM radio demod failed! [please help]

[ZephyrFanBoy]

Steps reproduce:

• Load the file: Pothos Flow simple FM radio demod failed!
• click activate:
• in the message window in appear the errore / exceptions
  [08:49:00.491188] PothosFlow.MainWindow: Welcome to Pothos v0.8.0-PothosSDR-2021.07.25-vc16-x64
  [08:49:00.607090] PothosFlow.GraphEditor: Loading D:/_companies/PothosWare/simple_fm_demod.pothos
  [08:49:00.829761] PothosFlow.MainWindow: Initialization complete
  [08:49:01.077000] AudioSink: Using Echo Cancelling Speakerphone (P through MME
  [08:49:01.293000] SoapySDR: SoapyVOLKConverters: no VOLK config file found. Run volk_profile for best performance.
  [08:49:01.678000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.678000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.678000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] SoapySDR: Using format CF32.
  [08:49:01.747000] ::1: Exact sample rate is: 1102500.002464 Hz
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.747000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.763000] SoapyBlock: call setSampleRate threw: Exception: setSampleRate failed
  [08:49:01.763000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_write_reg failed with -5
  [08:49:01.763000] ::1: rtlsdr_demod_read_reg failed with -5
  [08:49:01.763000] SoapyBlock: call setFrequency threw: Exception: setFrequency failed

Environment:

• Windows 10 Enterprise N LTSC 64-bit 1809
• Pothos Flow v0.8.0-PothosSDR-2021.07.25-vc16-x64 (installed)
• SDRplay_RSP_API-Windows-3.09.exe (installed, to fix SDRplay service error )

Hardware:

• Intel NUC i7 10710u / 32GB RAM
• RTL-SDR v4 USBstick receiver