Cross-Compiling ROS fuerte for a Nao v4. roscore doesnt run

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Hi,I am using ROS fuerte compiled form source, NAO v4 and cross compilation with NAO toolchain.

Currently this configuration is compiled and running only on the pc (ubuntu 12.05), but I have this error when I run roscore on the nao.

nao [0] ~/ros-nao/ros $ roscore

Traceback (most recent call last): File "/home/nao/ros-nao/ros/fuerte/bin/roscore", line 4, in <module> import pkg_resources ImportError: No module named pkg_resources

Any suggestion?? Thanks.