When I go into "Advanced Wipe" and select all the partitions except Micro SD card, it says "Wipe Complete - Failed", and in red letters "failed to unmount /system (device or resource busy) , unable to wipe /system, unable to mount storage".
Before all of this I uninstalled Google Play Services and my Google App because of the "google play services stopped" error, then tried to restore using Titanium backup but it was saying "ten elements failed." That's my reason for trying to wipe everything and start fresh.
So having said all that, I can easily flash my ROM and Gapps again, but I'm concerned about these errors. I'm new at this and am very interested in finding out if I did something wrong.