Please make sure that "Trace output folder" have the write acess for NomadLAB.exe and RGPA.exe

Note : 

Check RGPA\NomadLAB\Config\CurrentSettings.ini file (defaut : C:\Users\yingwu.liu\Documents\RGPA\NomadLAB\Config ) to see the saving value in case the issue remains after reboot RGPA