Please help!!! Stuck in recovery lg d800 topic

I tried to flash a new Rom but when the installation was over I got stuck in recover, and now Every rom I try to install I get this message:
Skipping MD5 check: no MD5 file found
assert failed: run_program("/system/bin/loki.sh") == 0
E: Error executing updater binary in zip ' /sdcard/Download/cm-11........zip'
Error flashing zip
Please help!!!
I dont know what to do