What exactly does that mean? I got that while exploring the git annex command:

shiny-2:git-annex ovi$ pwd /Users/ovi/Sharing/git-annex shiny-2:git-annex ovi$ git annex map map /Users/ovi/Sharing/git-annex ok

running: dot -Tx11 /Users/ovi/Sharing/git-annex/.git/annex/map.dot

failed git-annex: map: 1 failed