Just wait. Phone is repairing itself. Must be some file corruption. Can take minutes, or even hours.....
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I'm rarely on any firmware long enough to develop any file system issues - nothing like a good flash with a full wipe to clean everything up
But I have read that it will eventually sort itself out.
Has it finished and rebooted yet?
Sent from my C6603 using xda app-developers app
Good luck, lets hope your data remains untac
Sent from my C6603 using xda app-developers app
No problem. If you have dual recovery, try TWRP next time. Cwm has a habit of corrupting cache partition on locked bootloader.
Sent from my C6603 using xda app-developers app