Build and Calibrations are OK, but creating a calibration file fails in Windows11

[ariben-1904]

I successfully built DiaplayCAL and seemingly run it correctly. But the program stalls the last part to produce a calibration file.
The ending of the log goes as follows. What is wrong with this?

2024-08-02 00:25:30,923 Brightness error = 0.000000 cd/m^2 (is 121.386765, should be 121.386765)
2024-08-02 00:25:30,923 White point error = 0.000000 deltaE
2024-08-02 00:25:30,923 Maximum neutral error (@ 0.017354) = 0.709059 deltaE
2024-08-02 00:25:30,923 Average neutral error = 0.282283 deltaE
2024-08-02 00:25:30,923 Failed to meet target 0.600000 delta E, got worst case 0.709059
2024-08-02 00:25:30,923 Number of measurements taken = 239
2024-08-02 00:25:30,923 Computing update to calibration curves...
2024-08-02 00:25:30,957 The instrument can be removed from the screen.
2024-08-02 00:25:31,688 Written calibration file 'PnP.cal'
2024-08-02 00:25:31,792 DisplayCAL: Reached EOF (OK)
2024-08-02 00:25:31,796 dispcal exitcode: 0
2024-08-02 00:25:31,796 Error('No calibration file has been created.')