Navigation stack, rosparam error! [help!]

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Hi all!

I have set up the navigation stack. And after running:

roslaunch navigation_for_segbot move_base.launch

I receive the following error msg:

error loading <rosparam> tag: 

    file does not exist [/home/abc/fuerte_workspace/sandbox/navigation_for_segbot/params/costmap_common_params.yaml]
XML is <rosparam command="load" file="$(find navigation_for_segbot)/params/costmap_common_params.yaml" ns="global_costmap"/>

Here is my roslaunch file:

<launch>
  <master auto="start"/>

  <!-- Run the map server -->
  <node name="map_server" pkg="map_server" type="map_server" args="$(find navigation_for_segbot)/maps/bwi_test_world.yaml"/>

  <!--- Run AMCL -->
  <include file="$(find amcl)/examples/amcl_omni.launch" />

  <node pkg="move_base" type="move_base" respawn="false" name="move_base" output="screen">
    <rosparam file="$(find navigation_for_segbot)/params/costmap_common_params.yaml" command="load" ns="global_costmap" />
    <rosparam file="$(find navigation_for_segbot)/params/costmap_common_params.yaml" command="load" ns="local_costmap" />
    <rosparam file="$(find navigation_for_segbot)/params/local_costmap_params.yaml" command="load" />
    <rosparam file="$(find navigation_for_segbot)/params/global_costmap_params.yaml" command="load" />
    <rosparam file="$(find navigation_for_segbot)/params/base_local_planner_params.yaml" command="load" />
  </node>
</launch>

And I have do have my

costmap_common_params.yaml

inside my params folder inside the packge.