Traceback (most recent call last):
  File "./waf", line 6, in ?
    imp.load_source("waf","waf-light")
  File "waf-light", line 315, in ?
    Scripting.Main()
  File "/media/sda1/build/xmms2/xmms2-devel/wafadmin/Scripting.py", line 120, in Main
    proj = read_cache_file(g_lockfile)
  File "/media/sda1/build/xmms2/xmms2-devel/wafadmin/Scripting.py", line 104, in read_cache_file
    proj = cPickle.load(file)
cPickle.UnpicklingError: invalid load key, '_'.