[Q] Tried to format /data with CWM, E:failed to mount /data (Invalid argument)

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http://forum.xda-developers.com – Hello, I recently rooted and installed a custom ROM CM10 nightly onto my transformer, and proceeded to wipe data as normal. I went to do it, and it was taking a long time, 5-6-7-8 mins passed and I thought something is wrong. So I force turned it off. Not that all it said for that time was "formatting /data..." or something. Well, it failed to boot as expected, so I tried wiping again with no luck. Went and flashed TWRP recovery and it's showing errors: E:Unable to mount '/data' (tw_mount) E:failed to mount /data (Invalid argument) I'm not sure how to proceed due to lack o (HowTos)