NiTE2 userTracker.create() fail

I am using NiTE2 for tracking skeletons on kinect. The problem that I have on a PC (and not on another other one) is here :

auto status = nite::NiTE::initialize();
if (status != nite::STATUS_OK)
{
    nite::NiTE::shutdown();
    throw std::runtime_error("failed to initialize nite2");
}
status = user_tracker__.create();
if (status != nite::STATUS_OK)
{
       nite::NiTE::shutdown();
       throw std::runtime_error("failed to create the user tracker");
}

this is throwing me "failed to create the user tracker". I would like to know why. I am completely blocked. If you have a tip to have some clues... I just don't know where to search.

Thank you.