when i try to init my controller from storyboard in code I have an error : "
Missing proxy for identifier UpstreamPlaceholder-Kat-VH-9Yv.
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIProxyObject 0x7fad23db07f0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key containerView".
Check if you using Storyboard references
If YES - remove them and use push/present from code.
I already had similar situation and references was a reason of crashes. I don't know why, but sometimes adding them in one place can lead to crash in absolutely another without any connection. Only using step-by-step restore I found a reason