Guys, this is the same discussion thread here

http://community.elgg.org/pg/forum/topic/835550/problem-with-depreciated-in-17-get_entity-error--help-please/

@Peter  did also see the notice from DhrupDeScoop ? :-)

if ( ! elgg_is_admin_logged_in())  instead of if (elgg_is_admin_logged_in())

y'all ;-) of course pete did see note from me ! i've known him since way back and keep in touch re: such code fixes.. -- still ;-oO -- but i reckon all people have so far missed the 'point'. he can do that code himself - but busy as he is always - he was axing for the real "software developers.." (i.e.not kids;) to see they might wanna volunteer their time to do a pull from git and go on to complete the core code-fix he proposed. not just programming idleness... ;-P

This plugin may help. It creates a whitelist of admins who can see the notices.