Help with old IOS app in ObjC

I request help for an old app that was working 2 years ago but that then was put aside for other projects. Now it presents several deprecations and missing links I can't figure out anymore how to solve. I need somebody to help me out after I have provided the errors log.
IMPORTANT: the successful applicant will not be able to see the entire app for obvious reasons so he/she will have to deal with only part of the code.
Thank you