error while using openembedded to cross-compile ros [closed]

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Hello, I want to cross-compile the packages of ros, so that it can use on the arm.I am doing according to http://wiki.ros.org/hydro/Installatio... . When I execute: $ bitbake core-image-ros-roscore ,there was the following error:

Loading cache: 100% |######################################################| ETA:  00:00:00
Loaded 2176 entries from dependency cache.
Parsing recipes: 100% |####################################################| Time: 00:00:01
Parsing of 1701 .bb files complete (1698 cached, 3 parsed). 2178 targets, 68 skipped, 0 masked, 0 errors.
ERROR: No recipes available for:
  /home/znzx/devel/meta-ros/recipes-devtools/python/python_2.7.3.bbappend
  /home/znzx/devel/meta-ros/recipes-devtools/python/python-native_2.7.3.bbappend

Summary: There was 1 ERROR message shown, returning a non-zero exit code.

Please help me to solve the problem.Thank you very much.