Hi, I'm using GCMS (Agilent 78908 MSD), and during some sample analysis, I got an error message as " Background subtraction cannot be done. The matching background spectrum for the spectrum '+ Scan (rt:4.569 min) was not found". Here the GCMS report was not generated even though the peaks were there. This error appeared only for a few samples, and others were ok. Could you please assist me in sorting it out?