Why is this generated?
Since you had IGN switch set to Start/Ignition AND Eng Master Switch On AND N2<12% AND below FL 200 then Fadec attempts to do a "starter assist relight". Since the cross bleed valve is closed and the APU is not supplying Bleed Air (Normally) then the start valve can't open and the "Fault Message" is generated. Often you may notice ECAM also asks you to open the "X-Bleed Valve".
It's considered best practice to attempt a relight from QRH when you get to STATUS and consider OEBs, Resets & Expanded CL.