How to interprate a application revision using itunes - ios

Question

I'm just uploading an update of my swift/xcode project.
But, in the revision I get my application as rejected with the messsage:
We were unable to review your app as it crashed on launch. We have
attached detailed crash logs to help troubleshoot this issue.
Please revise your app and test it on a device while connected to an
IPv6 network (all apps must support IPv6) to ensure it will launch
without crashing.
I already tested the application in the emulators and physical devices and it's working good. But in the crash log says:
{"app_name":"SMD","timestamp":"2017-02-22 13:44:46.73 -0800","app_version":"1.8","slice_uuid":"22698b95-8afb-3280-95bcxxxxx","adam_id":0,"build_version":"8","bundleID":"com.bsn.xxx.xxx.xxx","share_with_app_devs":false,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 10.2.1 (14D27)","incident_id":"9CC007C2-1E44-xxxx-xxx-xxxx","name":"SMD"}
Incident Identifier: 9CC007C2-1E44-xxx-xxxx-xxxx
CrashReporter Key: c85f7089c245d2e6a851615f5e8862f0391xxxx
Hardware Model: xxx
Process: SMD [1003]
Path: /private/var/containers/Bundle/Application/A50BBAAD-A1E0-4992-97C1-01B14C4F7DF1/SMD.app/SMD
Identifier: com.bsn.sm.SMD.SMD
Version: 8 (1.8)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.bsn.sm.SMD.SMD [864]
Date/Time: 2017-02-22 13:44:46.6041 -0800
Launch Time: 2017-02-22 13:44:45.6077 -0800
OS Version: iPhone OS 10.2.1 (14D27)
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000100caa4a4
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread: 0
Filtered syslog:
None found
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libswiftCore.dylib 0x0000000100caa4a4 0x100b68000 + 1320100
1 libswiftCore.dylib 0x0000000100caa4a4 0x100b68000 + 1320100
2 SMD 0x000000010008a160 0x100080000 + 41312
3 Alamofire 0x00000001007bba14 0x100780000 + 244244
4 libdispatch.dylib 0x00000001877821fc 0x187781000 + 4604
5 libdispatch.dylib 0x00000001877821bc 0x187781000 + 4540
6 libdispatch.dylib 0x0000000187786d68 0x187781000 + 23912
7 CoreFoundation 0x00000001888a6810 0x1887c9000 + 907280
8 CoreFoundation 0x00000001888a43fc 0x1887c9000 + 898044
9 CoreFoundation 0x00000001887d22b8 0x1887c9000 + 37560
10 GraphicsServices 0x000000018a286198 0x18a27a000 + 49560
11 UIKit 0x000000018e8127fc 0x18e798000 + 501756
12 UIKit 0x000000018e80d534 0x18e798000 + 480564
13 SMD 0x00000001000ac360 0x100080000 + 181088
14 libdyld.dylib 0x00000001877b55b8 0x1877b1000 + 17848
Thread 1:
0 libsystem_kernel.dylib 0x00000001878c7a88 0x1878a8000 + 129672
1 libsystem_pthread.dylib 0x000000018798b344 0x18798a000 + 4932
2 libsystem_pthread.dylib 0x000000018798ad8c 0x18798a000 + 3468
Thread 2:
0 libsystem_kernel.dylib 0x00000001878c7a88 0x1878a8000 + 129672
1 libsystem_pthread.dylib 0x000000018798b344 0x18798a000 + 4932
2 libsystem_pthread.dylib 0x000000018798ad8c 0x18798a000 + 3468
Thread 3:
0 libsystem_kernel.dylib 0x00000001878c7a88 0x1878a8000 + 129672
1 libsystem_pthread.dylib 0x000000018798b344 0x18798a000 + 4932
2 libsystem_pthread.dylib 0x000000018798ad8c 0x18798a000 + 3468
Thread 4 name: com.apple.uikit.eventfetch-thread
Thread 4:
0 libsystem_kernel.dylib 0x00000001878a9188 0x1878a8000 + 4488
1 libsystem_kernel.dylib 0x00000001878a8ff8 0x1878a8000 + 4088
2 CoreFoundation 0x00000001888a65d0 0x1887c9000 + 906704
3 CoreFoundation 0x00000001888a41ec 0x1887c9000 + 897516
4 CoreFoundation 0x00000001887d22b8 0x1887c9000 + 37560
5 Foundation 0x000000018930f26c 0x189303000 + 49772
6 Foundation 0x000000018932fdd0 0x189303000 + 183760
7 UIKit 0x000000018f186c38 0x18e798000 + 10415160
8 Foundation 0x000000018940ce68 0x189303000 + 1089128
9 libsystem_pthread.dylib 0x000000018798d850 0x18798a000 + 14416
10 libsystem_pthread.dylib 0x000000018798d760 0x18798a000 + 14176
11 libsystem_pthread.dylib 0x000000018798ad94 0x18798a000 + 3476
Thread 5:
0 libsystem_kernel.dylib 0x00000001878c7a88 0x1878a8000 + 129672
1 libsystem_pthread.dylib 0x000000018798b344 0x18798a000 + 4932
2 libsystem_pthread.dylib 0x000000018798ad8c 0x18798a000 + 3468
Thread 6 name: com.apple.NSURLConnectionLoader
Thread 6:
0 libsystem_kernel.dylib 0x00000001878a9188 0x1878a8000 + 4488
1 libsystem_kernel.dylib 0x00000001878a8ff8 0x1878a8000 + 4088
2 CoreFoundation 0x00000001888a65d0 0x1887c9000 + 906704
3 CoreFoundation 0x00000001888a41ec 0x1887c9000 + 897516
4 CoreFoundation 0x00000001887d22b8 0x1887c9000 + 37560
5 CFNetwork 0x0000000188fd7a70 0x188ef8000 + 916080
6 Foundation 0x000000018940ce68 0x189303000 + 1089128
7 libsystem_pthread.dylib 0x000000018798d850 0x18798a000 + 14416
8 libsystem_pthread.dylib 0x000000018798d760 0x18798a000 + 14176
9 libsystem_pthread.dylib 0x000000018798ad94 0x18798a000 + 3476
Thread 7:
0 libsystem_kernel.dylib 0x00000001878c7a88 0x1878a8000 + 129672
1 libsystem_pthread.dylib 0x000000018798b160 0x18798a000 + 4448
2 libsystem_pthread.dylib 0x000000018798ad8c 0x18798a000 + 3468
Thread 8:
0 libsystem_pthread.dylib 0x000000018798ad88 0x18798a000 + 3464
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x000000010123c380 x1: 0x00000001700f1f80 x2: 0x0000000000000008 x3: 0x000000018790d22c
x4: 0x000000000000000e x5: 0x0000000000000020 x6: 0x0000000000000000 x7: 0x0000000000000bf0
x8: 0x00000001700f3680 x9: 0x00000001700f3680 x10: 0x0000000000000001 x11: 0xbaddc0dedeadbead
x12: 0x0000010000000100 x13: 0x206e6120676e6970 x14: 0x6c616e6f6974704f x15: 0x000a65756c617620
x16: 0x00000001878fd6b0 x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x0000000000000000
x20: 0x0000000000000002 x21: 0x0000000000000039 x22: 0x00000001003a7160 x23: 0x0000000000000002
x24: 0x000000000000000b x25: 0x00000001003a719a x26: 0xffffffffffffffff x27: 0x0000000170469f40
x28: 0x0000000002ffffff fp: 0x000000016fd7e760 lr: 0x0000000100caa4a4
sp: 0x000000016fd7e720 pc: 0x0000000100caa4a4 cpsr: 0x20000000
How I can find my issues there?

Answer 1

According to Apple's documentation
Swift code will terminate with this exception type if an unexpected
condition is encountered at runtime such as:
a non-optional type with a nil value
a failed forced type conversion
You might be accidentally unwrapping an optional with nil value or maybe doing something wrong in the type conversion(Refer this answer).
For IPv6 compatibility, you can go through Apple's documentation about it.