gerrit error

gistfile1.txt

raansu-ubuntu@ubuntu-16:~/LG_Volt_CM13$ repo upload kernel/lge/msm8226/

... A new repo command ( 1.23) is available.
... You should upgrade soon:

    cp /home/raansu-ubuntu/LG_Volt_CM13/.repo/repo/repo /home/raansu-ubuntu/bin/repo

Upload project kernel/lge/msm8226/ to remote branch cm-13.0:
  branch cm-13.0 ( 1 commit, Fri Aug 26 08:37:50 2016 -0700):
         5089b56e Fix compiling error
to review.cyanogenmod.org (y/N)? y
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

----------------------------------------------------------------------
[FAILED] kernel/lge/msm8226/ cm-13.0         (Upload failed)