mini-dinstall log notice (ERROR)

[Mini-Dinstall]

Unhandled exception; shutting down
Traceback (most recent call last):
  File "/home/groups/pkg-java/mini-dinstall", line 1165, in run
    self._index_all(1)
  File "/home/groups/pkg-java/mini-dinstall", line 1156, in _index_all
    self._index(self._arches + ['source'], force)
  File "/home/groups/pkg-java/mini-dinstall", line 1247, in _index
    self._index_impl(arches, force=force)
  File "/home/groups/pkg-java/mini-dinstall", line 1280, in _index_impl
    self._make_packagesfile(self._relpath(arch))
  File "/home/groups/pkg-java/mini-dinstall", line 1095, in _make_packagesfile
    self._make_indexfile(dir, 'packages', 'Packages')
  File "/home/groups/pkg-java/mini-dinstall", line 1074, in _make_indexfile
    newpackagesfile = open(newpackagesfilename, 'w')
IOError: [Errno 13] Permission denied: 'unstable/all/Packages.new'