$LU->readRights() deprecated in 0.15.1?

Hi,

I am using LU 0.15.1 and whenever trying to do a
print_r($LU->readRights()); it gives me: Fatal error: Call to
undefined function: readrights()

I was looking for info if it may be deprecated but found nothing. I am
using the Complex Perm container.

Is there another function for achieving this now? Maybe even one that
returns the field "right_define_name" in liveuser_rights?

Thanks in anticipation!
Benedikt