roslaunch failed, enviroment variable problem

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Hi all,

I have downloaded and compiled some Ros nodes from here (just to have more info). I am trying to launch the five ROS nodes with parameters using a launchfile that is taken from that repo.

After executing source catkin_ws/devel_isolated/setup.bash and executing roslaunch crab.launch(the launch file from the link above) the next error appears:

root@beaglebone:~# roslaunch crab.launch 
... logging to /root/.ros/log/4f6332fe-dbe2-11e3-86a8-7ec70b079d59/roslaunch-beaglebone-2067.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

started roslaunch server http://beaglebone:58881/

SUMMARY
========

PARAMETERS
 * /clearance
 * /duration_ripple
 * /duration_tripod
 * /joint_lower_limit
 * /joint_upper_limit
 * /port_name
 * /robot_description
 * /rosdistro
 * /rosversion
 * /trapezoid_h
 * /trapezoid_high_radius
 * /trapezoid_low_radius

NODES
  /
    crab_body_kinematics (crab_body_kinematics/body_kinematics)
    crab_gait (crab_gait/gait_kinematics)
    crab_imu (crab_imu/imu_control)
    crab_leg_kinematics (crab_leg_kinematics/leg_ik_service)
    crab_maestro_controller (crab_maestro_controller/controller_sub)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
ERROR: cannot launch node of type [crab_leg_kinematics/leg_ik_service]: can't locate node [leg_ik_service] in package [crab_leg_kinematics]
ERROR: cannot launch node of type [crab_maestro_controller/controller_sub]: can't locate node [controller_sub] in package [crab_maestro_controller]
ERROR: cannot launch node of type [crab_body_kinematics/body_kinematics]: can't locate node [body_kinematics] in package [crab_body_kinematics]
ERROR: cannot launch node of type [crab_gait/gait_kinematics]: can't locate node [gait_kinematics] in package [crab_gait]
ERROR: cannot launch node of type [crab_imu/imu_control]: can't locate node [imu_control] in package [crab_imu]

I have reinstalled the packages as suggested in some other threats about similar problems.

I also have noticed that

1º- if I move all the executablesof the nodes to the folder src/<package>/, I'm able to execute roslaunch crab.launch. But I don´t want to leave it like that, not proper way to work ;)

Additional info:

2º- If I execute, for example, source devel_isolated/<package>/setup.bashand then roslaunch crab.launch, the package which I have just source-d works and executes... (while the other still don't)

3º- So I have source-d all the source devel_isolated/<package>/setup.bash and try again: no one worked this time.

This leads to think that the problems are due to ROS variable enviroment: if I make an export | grep ROSafter 2º, I can see that the package path appears in $ROS_PATH-s and the others are not there:

root@beaglebone:~# export | grep ROS
declare -x ROS_DISTRO="hydro"
declare -x ROS_ETC_DIR="/opt/ros/hydro/etc/ros"
declare -x ROS_MASTER_URI="http://localhost:11311"
declare -x ROS_PACKAGE_PATH="/root/catkin_ws/src/crab_msgs:/root/catkin_ws/src/joy:/root/catkin_ws
/src/ps3joy:/root/catkin_ws/src/xacro:/root/catkin_ws/src/roslint:/root/catkin_ws/src/kdl_parser:/root/catkin_ws
/src/urdf:/root/catkin_ws/src/urdf_parser_plugin:/root/catkin_ws/src:/opt/ros/hydro/share:/opt/ros/hydro
/stacks:/root/ros_catkin_ws/install_isolated/share:/root/ros_catkin_ws/install_isolated/stacks"
declare -x ROS_ROOT="/opt/ros/hydro/share/ros"
declare -x ROS_TEST_RESULTS_DIR="/root/catkin_ws/build_isolated/crab_msgs/test_results"

root@beaglebone:~# source catkin_ws/devel_isolated/crab_imu/setup.bash
declare -x ROS_PACKAGE_PATH="/root/catkin_ws/src/crab_imu:/root/catkin_ws/src/crab_msgs:/root/catkin_ws
/src/joy:/root/catkin_ws/src/ps3joy:/root/catkin_ws/src/xacro:/root/catkin_ws/src ...