Default [Q] uploading changes to gerrit

Hi,

I have changed a file and I wanted to upload it to gerrit for review.
I've never done that before. I followed this guide http://wiki.cyanogenmod.org/w/Doc:_using_gerrit
I have set up everything on my side and on review.cyanogenmod.org

when I do "repo upload" I get
Code:
root@matt:~/m7ul# repo upload
Upload project frameworks/base to remote branch refs/heads/cm-11.0:
  branch patch-1 ( 1 commit, Mon Dec 30 11:39:12 2013 +0000):
         47614ef1 my changes
to review.cyanogenmod.org (y/N)? y
Uncommitted changes in CyanogenMod/frameworks/base (did you forget to amend?). Continue uploading? (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] frameworks/base/ patch-1         (Upload failed)
What am I doing wrong?