Exclamation [q] please help with cwm root, backup

ok heres my issue i want to mack a backup of my recovery but when i open boot loaded it shows i have CWM but it keeps telling me this
"E: Can't mount /cache/recovery/command
E: Can't mount /cache/recovery/log
E: Can't open /cache/recovery/log
E: Can't mount /cache/recovery/last_log
E: Can't open /cache/recovery/last_log"


i have done some searching as to the problem but cant find much help. my phone is sgs3 by sprint SPH-L710, i have done the clockworkmod, and watching QBKing77's video tutorial on youtube. my sgs3 has been updated to 4.3 with KNOX i have never checked marked KNOX in my settings and it did have a check when i first found it... any help would be great. i just replaced this sgs3 4 days ago due to a bad rom install with no backup which "hard bricked" my previous sgs3... i cant afford the 150$ deductable again.. please and thank you in advance. thanks for your time..

P.S.
yes im a noob but i learn fast