I’m new to wordpress just installed it last night… today I loaded a theme from the worpress theme website and I started having this exact same problem…. I got the patch but it didn’t work…I tried commenting out those lines and it just got a white screen instead of the error. I tried everything I could think of with no success but then i decided to delete the new theme just to see if it made a difference and my site reverted back to the default theme and the login is now working. I put the theme back out there made it my theme and it broke again… so i’m just running default theme now. I don’t know why this is connected but are the themes version specific? I noticed others on this board are still having the issue after the patch so give that a try maybe it will at least get you logged back in?
