Default Unable to install CWM on my I8262 samsung galaxy core

androidforums(.)com/galaxy-grand-quattro-all-things-root/768922-e-unknown-volume-path-sdcard.html

can anyone plz solve this solve. I hav d same issue as this.
i am currently not able to post outside links. so plz coperate, remove brackets in my link.
PLZ HELP, em seriously freaked out