Session page not show on ios build with xcode 7.1 

Hi, Thanks for your writing but I've got a problem when build ios. Session page not show value, whereas conference project well working on browser:

http://prntscr.com/8u3fj0

and picture when build on xcode 7:
http://prntscr.com/8u3l9p

i don't know why? please help me:))
