Default [Q] HELP! SD card mount error

I am very new to this so I will need some help, I have a LG G pro that is rooted, it is on the CWM and I want to put cyanogenmod 10.2 on it. I downloaded the file and put it on my sd card but everytime I go into the boot menu and select install zip from sd card I get the following errors read back to me,
unknown volume for path [/sdcard/]
cant mount /sdcard/
unknown volume for path [/sdcard/clockworkmod/.recovery_version]
the only reason I rooted my phone was to put cm 10.2 on it. can someone please tell me what to do?