gazebo spawning objects crash

edit

Hi guys, I have the following launch file in my project:

<launch>

 <!-- Launch PR2 in empty world -->
 <include file="$(find pr2_gazebo)/pr2_empty_world.launch"/>

 <!-- send urdf to param server -->
 <param name="object1" textfile="/home/x/ros_workspace/project/objects/urdf/object1.urdf" />
 <param name="object2" textfile="/home/ros_workspace/project/objects/urdf/object2.urdf" />

 <!-- push urdf to factory and spawn robot in gazebo -->
 <node name="spawn_object1" pkg="gazebo" type="spawn_model" args="-urdf -param object1 -x 3.0 -y 3.0 -z 0.1  -model object1" respawn="false" output="screen" />
 <node name="spawn_object2" pkg="gazebo" type="spawn_model" args="-urdf -param object2 -x 2.75 -y 3.5 -z 0.25  -model object2" respawn="false" output="screen" />

</launch>

Then file /home/x/ros_workspace/project/objects/urdf/object1.urdf contains:

<robot name="litterbox_model">
  <link name="litterbox_body">
    <inertial>
      <mass value="10.0" />
      <!-- center of mass (com) is defined w.r.t. link local coordinate system -->
      <inertia  ixx="1.0" ixy="0.0"  ixz="0.0"  iyy="1.0"  iyz="0.0"  izz="1.0" />
    </inertial>
    <visual>
        <geometry>
        <mesh filename="object1.stl"/>
      </geometry>
    </visual>
    <collision>
        <geometry>
        <mesh filename="object1.stl"/>
      </geometry>
    </collision>
  </link>
  <gazebo reference="litterbox_body">
    <material>Gazebo/Red</material>
  </gazebo>
</robot>

and object1.stl is in the same location /home/x/ros_workspace/project/objects/urdf/

This code used to work, after a format I am not cabable of finding what is the issue. ROS aborts with the following message:

spawn status:  SpawnModel: successfully spawned model
spawning success True
Error: [/tmp/buildd/ros-diamondback-simulator-gazebo-1.2.8/debian/ros-diamondback-simulator-gazebo/opt/ros/diamondback/stacks/simulator_gazebo/gazebo/build/gazebo/server/MeshManager.cc:137]
Unable to find file[object1.stl]
Service call failed: transport error completing service call: unable to receive data from sender, check sender's logs for details
spawning success None
Service call failed: transport error completing service call: unable to receive data from sender, check sender's logs for details
spawning success None

any idea? I really don't know what could be the issue. Thanks