It looks like you either have no or a wrong access token.
Please go to Semplice -> General Settings and setup your access token.
Error Message from Instagram: The access_token provided is invalid.

[unex_ce_instagram id="content_4rsiyjz2h" count="33" span="span3" is_fluid="yes" remove_gutter="no" target="lightbox" random="disabled"][/ce_instagram]