Wrapper is not compatible with NFS shares.
There is a way around this here: http://www.futeko.com/newforum/index.php?topic=813.0
By not using wrapper you are missing out on 7.1 audio support, HiMedia Imprex settings from menu button (although if you play something with MediaCenter app, change settings, then return to Kodi you'll find settings saved for Kodi too), and some performance (Himediaplayer/wrapper is better at high bitrates).