Harpal sidhu

I filed ITR2 FOR AY-20-21.I realized after few days that mistakes has been made in CFL. MY CFL WAS FILLED IN MY Wife's return, besides a calculation mistake in CG. So I revised, generated XML. BUT WHILE LOADING THE XML, site said that only one return be filed. "Change section & retry". I am stuck up, please help me with the solution, so that I may upload the XML. I have deposited the extra tax calculated.