[yocto] "yocto-kernel config list yocto-bsp" throws error

[Mathias Rudnik]

Hi,

when issuing the command "$ yocto-kernel config list yocto-bsp" command 
i get following error message:

Traceback (most recent call last):
   File "/home/c0dix/Downloads/Font/poky/scripts/yocto-kernel", line 
394, in <module>
     ret = main()
   File "/home/c0dix/Downloads/Font/poky/scripts/yocto-kernel", line 
389, in main
     invoke_subcommand(args, parser, yocto_kernel_help_usage, subcommands)
   File "/home/c0dix/Downloads/Font/poky/scripts/lib/bsp/help.py", line 
73, in invoke_subcommand
     subcommands.get(args[0], subcommand_error)[0](args[1:], usage)
   File "/home/c0dix/Downloads/Font/poky/scripts/yocto-kernel", line 65, 
in yocto_kernel_config_list_subcommand
     yocto_kernel_config_list(scripts_path, args[0])
   File "/home/c0dix/Downloads/Font/poky/scripts/lib/bsp/kernel.py", 
line 191, in yocto_kernel_config_list
     config_items = read_config_items(scripts_path, machine)
AttributeError: 'NoneType' object has no attribute 'readlines'

Any ideas how to solve this problem?