openni_tracker "Find user generator failed"

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Hi all!

I try to run openni_tracker as follows:

rosrun openni_tracker openni_tracker

after I have launched

roslaunch openni_launch openni.launch

The problem is that when I run the tracker I get an error:

[ERROR] Find user generator failed: This operation is invalid!

Just in case: if I try to run it once more I get no respond and then:

[ERROR] InitFromXml failed: Got a timeout while waiting for a network command to complete!

I believe that "find user" error is generated from the line 150 of the file openni_tracker.cpp in /opt/ros/fuerte/stacks/openni_tracker/src:

149: nRetVal = g_UserGenerator.Create(g_Context);
150: CHECK_RC(nRetVal, "Find user generator");

Which goes to a macro:

#define CHECK_RC(nRetVal, what)                                    \ 
    if (nRetVal != XN_STATUS_OK)                                      \
    {                                                                 \
        ROS_ERROR("%s failed: %s", what, xnGetStatusString(nRetVal)); \
        return nRetVal;                                               \
    }

So g_UserGenerator.Create(g_Context) for some reason returns not XN_STATUS_OK.

Maybe someone had that issue and knows how to resolve it. As you may have noticed I run ros-fuerte. Ubuntu 12.04

PS. I'm still fairly new to ROS, so any suggestions of actions that I can take are welcome :) I tried to change the file openni_tracker.cpp and recompile openni_tracker via rosmake openni_tracker, but that doesn't actually do the trick. Would be gratefull if someone could point me my mistakes. I know that there are a couple of questions that look like this one, but none of those is solved, though it's an important part of ros, I think. Thanks in advance.

UPD: I also experience this error on another ubuntu 12.04 PC in my lab. So it seems like this is fuerte+Ubuntu 12.04 issue. I don't have this error on Ubuntu 10.04 and ros-fuerte.