Thumbs up Error Installing Cm11 , no flash /system?

hello friend, I'm from Peru, I am new to the world of roms customs, come from Xperia D 4.9 and is a little lag and unstable the kitkat, I have decided to install Cm 11, but when flashing with TWRP + update recovery, excellent installation, but I bootsloop with TWRP THROUGH file manager I've realized not to flash / system? . I hope you help me. Thank you.