[U-Boot] trouble with patman

[Hannes Schmelzer]

hi,

i created some commit which i want to post into the mailing list usind 
patman.py.

I get following error, where i've no idea about the root cause ...

~/work/u-boot $ tools/patman/patman.py -n
Cleaned 1 patches
Traceback (most recent call last):
   File "tools/patman/patman.py", line 158, in <module>
     options.add_maintainers)
   File "/home/schmelzerh/work/u-boot/tools/patman/series.py", line 222, 
in MakeCcFile
     raise_on_error=raise_on_error)
   File "/home/schmelzerh/work/u-boot/tools/patman/gitutil.py", line 
321, in BuildEmailList
     raw += LookupEmail(item, alias, raise_on_error=raise_on_error)
   File "/home/schmelzerh/work/u-boot/tools/patman/gitutil.py", line 
495, in LookupEmail
     raise ValueError, msg
ValueError: Alias 'gpio' not found


any suggestions ?

many thanks and best regards,
Hannes