AppDelegate Could not load NIB in bundle: 'NSBundle'

[toreeliu]

2021-03-13 14:11:21.383167+1100 SDKExample[18925:4699547] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle </private/var/containers/Bundle/Application/703CCD85-5431-47B8-9A51-E03295348928/SDKExample.app> (loaded)' with name 'ConversationListViewController''
*** First throw call stack:
(0x19f8ea5ac 0x1b39d842c 0x19f7e6a9c 0x1a1e3082c 0x1a1b11128 0x1a1b114d8 0x1a1b11b90 0x1a1a61bf0 0x1a1a03138 0x1a19ff200 0x1a26db138 0x1a221ce30 0x1a220bbec 0x1a223f078 0x19f866444 0x19f860858 0x19f860e08 0x19f8604bc 0x1b6372820 0x1a220d164 0x1a2212840 0x100fa77f8 0x19f527e40)
libc++abi.dylib: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle </private/var/containers/Bundle/Application/703CCD85-5431-47B8-9A51-E03295348928/SDKExample.app> (loaded)' with name 'ConversationListViewController''
terminating with uncaught exception of type NSException
(lldb) 

[toreeliu]

I am using the example in this SDK without any modify except the setup and registerUser in AppDelegate.