App is quit automatically when try to open .

Hello
I have used dropbox sdk . I have choose the carthage process for installing dropbox. After that sdk app working but after quit the app if try to reopen the app then app quit automatically and same happen in ipad .

deployment target : 9.1
testing in iPad ios 9.3, simulator 10.2

let me know the problem.

Console of simulator

```
[MC] Reading from private effective user settings.
2017-06-15 18:23:08.512 Survey[4847:179388] fetch
2017-06-15 18:23:08.587373 Survey[4847:179481] [] nw_host_stats_add_src recv too small, received 24, expected 28
2017-06-15 18:23:08.588373 Survey[4847:179481] [] nw_host_stats_add_src recv too small, received 24, expected 28
2017-06-15 18:23:08.593785 Survey[4847:179481] [] nw_host_stats_add_src recv too small, received 24, expected 28
2017-06-15 18:23:08.599422 Survey[4847:179481] [] ____nwlog_simulate_crash_inner_block_invoke dlopen CrashReporterSupport failed
2017-06-15 18:23:08.600035 Survey[4847:179481] [] __nwlog_err_simulate_crash simulate crash failed "nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available"
2017-06-15 18:23:08.602452 Survey[4847:179481] [] nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace:
[x86_64] libnetcore-856.30.16
0 libsystem_network.dylib 0x0000000114ee2666 __nw_create_backtrace_string + 123
1 libnetwork.dylib 0x00000001149f4006 nw_socket_add_input_handler + 3164
2 libnetwork.dylib 0x00000001149d1555 nw_endpoint_flow_attach_protocols + 3768
3 libnetwork.dylib 0x00000001149d0572 nw_endpoint_flow_setup_socket + 563
4 libnetwork.dylib 0x00000001149cf298 -[NWConcrete_nw_endpoint_flow startWithHandler:] + 2612
5 libnetwork.dylib 0x00000001149eaae1 nw_endpoint_handler_path_change + 1261
6 libnetwork.dylib 0x00000001149ea510 nw_endpoint_handler_start + 570
7 libnetwork.dylib 0x0000000114a021f9 nw_endpoint_resolver_start_next_child + 2240
8 libdispatch.dylib 0x0000000114c5f978 _dispatch_call_block_and_release + 12
9 libdispatch.dylib 0x0000000114c890cd _dispatch_client_callout + 8
10 libdispatch.dylib 0x0000000114c66e17 _dispatch_queue_serial_drain + 236
11 libdispatch.dylib 0x0000000114c67b4b _dispatch_queue_invoke + 1073
12 libdispatch.dylib 0x0000000114c6a385 _dispatch_root_queue_drain + 720
13 libdispatch.dylib 0x0000000114c6a059 _dispatch_worker_thread3 + 123
14 libsystem_pthread.dylib 0x00000001150324de _pthread_wqthread + 1129
15 libsystem_pthread.dylib 0x0000000115030341 start_wqthread + 13
2017-06-15 18:23:08.846037 Survey[4847:179481] [] nw_host_stats_add_src recv too small, received 24, expected 28
2017-06-15 18:23:08.855860 Survey[4847:179481] [] __nwlog_err_simulate_crash simulate crash already simulated "nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available"
2017-06-15 18:23:08.857598 Survey[4847:179481] [] nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace:
[x86_64] libnetcore-856.30.16
0 libsystem_network.dylib 0x0000000114ee2666 __nw_create_backtrace_string + 123
1 libnetwork.dylib 0x00000001149f4006 nw_socket_add_input_handler + 3164
2 libnetwork.dylib 0x00000001149d1555 nw_endpoint_flow_attach_protocols + 3768
3 libnetwork.dylib 0x00000001149d0572 nw_endpoint_flow_setup_socket + 563
4 libnetwork.dylib 0x00000001149cf298 -[NWConcrete_nw_endpoint_flow startWithHandler:] + 2612
5 libnetwork.dylib 0x00000001149eaae1 nw_endpoint_handler_path_change + 1261
6 libnetwork.dylib 0x00000001149ea510 nw_endpoint_handler_start + 570
7 libnetwork.dylib 0x0000000114a021f9 nw_endpoint_resolver_start_next_child + 2240
8 libdispatch.dylib 0x0000000114c890cd _dispatch_client_callout + 8
9 libdispatch.dylib 0x0000000114c6516c _dispatch_continuation_pop + 1091
10 libdispatch.dylib 0x0000000114c7a1de _dispatch_source_latch_and_call + 195
11 libdispatch.dylib 0x0000000114c72d79 _dispatch_source_invoke + 1098
12 libdispatch.dylib 0x0000000114c670d8 _dispatch_queue_serial_drain + 941
13 libdispatch.dylib 0x0000000114c67b4b _dispatch_queue_invoke + 1073
14 libdispatch.dylib 0x0000000114c6a385 _dispatch_root_queue_drain + 720
15 libdispatch.dylib 0x0000000114c6a059 _dispatch_worker_thread3 + 123
16 libsystem_pthread.dylib 0x00000001150324de _pthread_wqthread + 1129
17 libsystem_pthread.dylib 0x0000000115030341 start_wqthread + 13

```

Thanks