Lot of error with LiveUser

[Isabel]

I'm trying to use LiveUser, and I receive a lot of erros, even i copying the tutorial's examples.

Here is one of them:

parse error, unexpected T_VARIABLE

This is the code:

$user_auth_id=$objRightsAdminAuth->addUser('johndoe', 'dummypass', true);

if (DB::isError($user_auth_id))
{
_$user_auth_id->getMessage(); ---> this line is the problem
_//exit;
}

What is the problem??

If anybody has a little example that really works, I really apreciate if you sharing it with me...

Thanks a lot!