Gazebo 1.5 crash on startup, InvalidNameException

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I had some problems with old sdf files, I got warnings with the default empty_world so I now use a custom empty world.

Warning [parser.cc:361] Converting a deprecated SDF source[/opt/ros/groovy/stacks/simulatorgazebo/gazeboworlds/worlds/empty.world]. Set SDF value Version[1.2] to Version[1.3] Please use the gzsdf tool to update your SDF files. $ gzsdf convert [sdf_file] Would these files be fixed if I reinstall ROS Groovy?

But the InvalidNameException persists, what could cause this?

lennart@Flaptop:~/catkin_ws/src/beginner_tutorials$ roslaunch beginner_tutorials empty_sdf.launch 
... logging to /home/lennart/.ros/log/9cb9bd36-f6d5-11e2-b449-0025b3bf3892/roslaunch-Flaptop-8479.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://Flaptop:33673/

SUMMARY
========

PARAMETERS
 * /rosdistro
 * /rosversion
 * /use_sim_time

NODES
  /
    gazebo (gazebo/gazebo)
    gazebo_gui (gazebo/gui)

auto-starting new master
process[master]: started with pid [8494]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 9cb9bd36-f6d5-11e2-b449-0025b3bf3892
process[rosout-1]: started with pid [8507]
started core service [/rosout]
process[gazebo-2]: started with pid [8521]
process[gazebo_gui-3]: started with pid [8526]
Gazebo multi-robot simulator, version 1.5.0
Copyright (C) 2013 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Gazebo multi-robot simulator, version 1.5.0
Copyright (C) 2013 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Msg Waiting for master.terminate called after throwing an instance of 'ros::InvalidNameException'
  what():  Character [] at element [8] is not valid in Graph Resource Name [gazeboeb].  Valid characters are a-z, A-Z, 0-9, / and _.
Aborted (core dumped)
[gazebo-2] process has died [pid 8521, exit code 134, cmd /opt/ros/groovy/stacks/simulator_gazebo/gazebo/scripts/gazebo /home/lennart/catkin_ws/src/beginner_tutorials/worlds/empty_sdf.world __name:=gazebo __log:=/home/lennart/.ros/log/9cb9bd36-f6d5-11e2-b449-0025b3bf3892/gazebo-2.log].
log file: /home/lennart/.ros/log/9cb9bd36-f6d5-11e2-b449-0025b3bf3892/gazebo-2*.log

The launch file:

<launch>

  <arg name="paused" default="false"/>
  <arg name="use_sim_time" default="true"/>
  <arg name="gui" default="true"/>
  <arg name="throttled" default="false"/>

  <!-- set use_sim_time flag -->
  <group if="$(arg use_sim_time)">
    <param name="/use_sim_time" value="true" />
  </group>


  <!-- start empty world -->
  <group if="$(arg paused)">
    <group if="$(arg throttled)">
      <node name="gazebo" pkg="gazebo" type="gazebo" args="-u $(find beginner_tutorials)/worlds/empty_throttled.world" respawn="false" output="screen"/>
    </group>
    <group unless="$(arg throttled)">
      <node name="gazebo" pkg="gazebo" type="gazebo" args="-u $(find beginner_tutorials)/worlds/empty_sdf.world" respawn="false" output="screen"/>
    </group>
  </group>
  <group unless="$(arg paused)">
    <group if="$(arg throttled)">
      <node name="gazebo" pkg="gazebo" type="gazebo" args="$(find beginner_tutorials)/worlds/empty_throttled.world" respawn="false" output="screen"/>
    </group>
    <group unless="$(arg throttled)">
      <node name="gazebo" pkg="gazebo" type="gazebo" args="$(find beginner_tutorials)/worlds/empty_sdf.world" respawn="false" output="screen"/>
    </group>
  </group>

  <!-- start gui -->
  <group if="$(arg gui)">
    <node name="gazebogui" pkg="gazebo" type="gui" respawn="false" output="screen"/>
  </group>

</launch>