I saw the mentioned error when trying to import an old repository into gitolite.
The gitolite repositories directory contains the ".git" folder of "bare" repositories. That means if one want to import a repository into gitolite, he should do the following:
-- be sure the oldrepo is a bare git repository
-- run the folloeing as a gtolite user
cd $HOME
cp -R oldrepo/.git repositories/oldrepo.git
gitolite setup
My mistake was to put the old repository as a directory that contains a ".git". I've find out it was wrong.
For example my old repository:
os-HP /home/gitrepo/repositories $ ll scripts/.git/
total 52
drwxrwsrwx 8 gitrepo gitrepo 4096 Jan 25 10:59 .
drwxrwsrwx 3 gitrepo gitrepo 4096 Jul 26 15:48 ..
drwxrwsrwx 2 gitrepo gitrepo 4096 Jan 25 10:49 branches
-rwxrwxrwx 1 gitrepo gitrepo 8 Jan 25 10:53 COMMIT_EDITMSG
-rw-rw-r-- 1 gitrepo gitrepo 91 Jan 25 10:59 config
-rwxrwxrwx 1 gitrepo gitrepo 73 Jan 25 10:49 description
-rwxrwxrwx 1 gitrepo gitrepo 23 Jan 25 10:49 HEAD
drwxrwsrwx 2 gitrepo gitrepo 4096 Jan 25 10:49 hooks
-rwxrwxrwx 1 gitrepo gitrepo 264 Jan 25 10:53 index
drwxrwsrwx 2 gitrepo gitrepo 4096 Jan 25 10:49 info
drwxrwsrwx 3 gitrepo gitrepo 4096 Jan 25 10:52 logs
drwxrwsrwx 133 gitrepo gitrepo 4096 Jun 28 08:50 objects
drwxrwsrwx 4 gitrepo gitrepo 4096 Jan 25 10:49 refs
Comparing to the testing repository that is shipped with gitolite:
ey ~/repositories $ ll testing.git/
total 40
drwx------ 7 gitrepo gitrepo 4096 Jul 26 02:37 .
drwx------ 5 gitrepo gitrepo 4096 Jul 26 08:46 ..
drwx------ 2 gitrepo gitrepo 4096 Jul 26 02:37 branches
-rw------- 1 gitrepo gitrepo 66 Jul 26 02:37 config
-rw------- 1 gitrepo gitrepo 0 Jul 26 05:16 git-daemon-export-ok
-rw------- 1 gitrepo gitrepo 120 Jul 26 05:16 gl-conf
-rw------- 1 gitrepo gitrepo 23 Jul 26 02:37 HEAD
drwx------ 2 gitrepo gitrepo 4096 Jul 26 05:13 hooks
drwx------ 2 gitrepo gitrepo 4096 Jul 26 02:37 info
drwx------ 10 gitrepo gitrepo 4096 Jul 26 03:05 objects
drwx------ 4 gitrepo gitrepo 4096 Jul 26 02:37 refs