It is solved becaurse PHP7 is the problem. If you return to PHP 5.4 Rootspersona will work again.
See the Rootspersona Google group at https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/rootspersona-support-forum/OFpNESvs4sY/WmJGLzibAgAJ
