Problem running gazebo 0.10.0

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Problem running gazebo 0.10.0

$ uname -a
Linux samurai 2.6.34-ARCH #1 SMP PREEMPT Mon Jul 5 22:12:11 CEST 2010 x86_64 Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz GenuineIntel GNU/Linux

I have installed all the dependencies of gazebo 0.10.0 (except the optional dependency websim), then compiled and installed gazebo.

Player v.3.0.2
bullet 2.76-2
ogre 1.7.1-2

When I try running gazebo while specifying a world file...
$ gazebo -grnp /usr/local/share/gazebo/worlds/
Gazebo multi-robot simulator, version 0.10.0

Part of the Player/Stage Project [].
Copyright (C) 2003 Nate Koenig, Andrew Howard, and contributors.
Released under the GNU General Public License.

/usr/local/share/gazebo/worlds/ parser error : Document is empty

/usr/local/share/gazebo/worlds/ parser error : Start tag expected, '<' not found

Error Loading Gazebo
/home/katana/builds/robot/gazebo-0.10.0/server/ : Exception: The XML config file can not be loaded, please make sure is a correct file
/home/katana/builds/robot/gazebo-0.10.0/server/ : Exception: Unable to parse xml file: /usr/local/share/gazebo/worlds/

The file does not seem to be empty when I opened it with vim...
I tried other world files, and I got the same error.