Error BITBAKE

[emanuele bottegoni]

In deep I have this error log:

matteo at matteo-desktop:/stuff$ bitbake angstrom-minimal-image
NOTE: Handling BitBake files: / (4647/4647) [100 %]
NOTE: Parsing finished. 0 cached, 4427 parsed, 220 skipped, 0 masked.
Traceback (most recent call last):
  File "/stuff/bitbake/bin/bitbake", line 117, in <module>
    main()
  File "/stuff/bitbake/bin/bitbake", line 113, in main
    cooker.cook()
  File "/stuff/bitbake/lib/bb/cooker.py", line 495, in cook
    self.updateCache()
  File "/stuff/bitbake/lib/bb/cooker.py", line 470, in updateCache
    self.parse_bbfiles(filelist, masked, self.myProgressCallback)
  File "/stuff/bitbake/lib/bb/cooker.py", line 599, in parse_bbfiles
    def parse_bbfiles(self, filelist, masked, progressCallback = None):
  File "/stuff/bitbake/lib/bb/cooker.py", line 654, in parse_bbfiles
    self.bb_cache.sync()
  File "/stuff/bitbake/lib/bb/cache.py", line 245, in sync
    p = pickle.Pickler(file(self.cachefile, "wb" ), -1 )
IOError: [Errno 13] Permission denied:
'/stuff/tmp/cache/at91sam9263ek/bb_cache.dat'