Unable to mount /system, Error mounting /system!
So guys, I downloaded the latest CM nightly through the CMupdater app, I rebooted into recovery TWRP 22.214.171.124 at that moment I think, when I tried to flash my update it said "Unable to mount /system" and just stood there, I rebooted into recovery again and tried to mount it from the mounts menu without result.
Next I updated to the latest TWRP but the problem persisted, changed to the latest CWM and that too, is unable to mount /system displaying the message "Error mounting /system!"
I seriously don't want to lose my data as this was a simple update so I didn't make a backup but I don't know what the hell else I'm supposed to do.
Oh and BTW, trying to boot to system leaves me at the Google screen for an indefinite amount of time.
Thanks in advance
Edit:Turns out formatting system doesn't delete my data, I got impatient and did that, problem solved.