tools /config.py --kernel release

$tools/config.py --kernel release
WARNING: root: -k option is deprecated. Ignored.
Traceback (most recent call last):
  File "tools/config.py", line 412, in<module>
    dest=Defconfig(base, manager)
  File "tools/config.py", line 157, in __init__
    self.path=manager.get_fullpath(name)
  File "tools/config.py", line 111, inget_fullpath
    raise RuntimeError('Config'%s"not found'%name)
RuntimeError: Config "release" not found