With the Unity wikitude sdk (8.0.0), I got the same problem on iOS.
dyld: Library not loaded: @rpath/WikitudeSDK.framework/WikitudeSDK Referenced from: /var/containers/Bundle/Application/1A3C6F0E-F253-4F61-9685-8A9F99F47593/ana.app/ana Reason: image not found (lldb)
in Xcode. I get it as soon as Unity loads onto my phone. I don't even get a splash screen.
However I had it solved by adding
WikitudeSDK.framework onto "Embedded Binaries" under "General" section.