error: insufficient permission

Hi,

may please somebody help me with the following issue. I try to checkin changes to a repository I created. Seems like I have some permission problems, but I can't figure out whats going wrong:

$ git commit -m 'test'
Created commit 07b3a4a: test
 1 files changed, 1 insertions(+), 1 deletions(-)
$ git push
Counting objects: 8, done.
Compressing objects: 100% (6/6), done.
Writing objects: 100% (6/6), 1.56 KiB, done.
Total 6 (delta 4), reused 0 (delta 0)
error: insufficient permission for adding an object to repository 
database ./objects

fatal: failed to write object
error: unpack failed: unpacker exited with error code
To /homes/[...]
 ! [remote rejected] master -> master (n/a (unpacker error))
error: failed to push some refs to '/homes/[...]'

Thanks, Dominic