Error: Protocol not available, dumping backtrace

2016-09-17 15:16:04.386085 appDemo[2371:94976] [] __nwlog_err_simulate_crash simulate crash already simulated **"nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available"**
2016-09-17 15:16:04.386676 appDemo[2371:94976] [] nw_socket_set_common_sockopts setsockopt SO_NOAPNFALLBK failed: [42] Protocol not available, dumping backtrace:
        [x86_64] libnetcore-856.1.8
    0   libsystem_network.dylib             0x0000000112dc780e __nw_create_backtrace_string + 123
    1   libnetwork.dylib                    0x0000000113bfa194 nw_socket_add_input_handler + 3002
    2   libnetwork.dylib                    0x0000000113bd7db8 nw_endpoint_flow_attach_protocols + 3768
    3   libnetwork.dylib                    0x0000000113bd6dd5 nw_endpoint_flow_setup_socket + 563
    4   libnetwork.dylib                    0x0000000113bd5b34 -[NWConcrete_nw_endpoint_flow startWithHandler:] + 2612
    5   libnetwork.dylib                    0x0000000113bf0d11 nw_endpoint_handler_path_change + 1261
    6   libnetwork.dylib                    0x0000000113bf0740 nw_endpoint_handler_start + 570
    7   libdispatch.dylib                   0x0000000112b44980 _dispatch_call_block_and_release + 12
    8   libdispatch.dylib                   0x0000000112b6e
2016-09-17 15:16:04.387153 appDemo[2371:94976] [] nw_endpoint_flow_attach_protocols [2 192.168.0.100:80 in_progress socket-flow (satisfied)] Attached flow protocol
2016-09-17 15:16:04.387679 appDemo[2371:94976] [] nw_connection_endpoint_report [2 192.168.0.100:80 in_progress socket-flow (satisfied)] reported event flow:start_connect

I'm using xcode 8 version with ios 10. Now, I'm working an API. If, I use the API in Xcode 7 its works fine but when same API I used in xcode 8 error message appears Unable to parse.

I found the solution as follows:

1. In XCode menu, Go to Product > Scheme > Edit Scheme
2. Open the Arguments tab
3. Add the Environment Variable :- OS_ACTIVITY_MODE is disable

There's no SO_NOAPNFALLBK socket option in man socket. I guess, this option is added by Apple and is related to push notifications services, which are not available on simulator.

A cleaner solution (than the one given by Ankit Goyal) that fixes Simulator logs without affecting Device logs is available at https://stackoverflow.com/a/39651073/1033581:

1. Under Product > Scheme > Edit Scheme... > Run, set the OS_ACTIVITY_MODE environment variable to ${DEBUG_ACTIVITY_MODE} so it looks like this:

2. Go to your project build settings, and click + to add a User-Defined Setting named DEBUG_ACTIVITY_MODE. Expand this setting and Click the + next to Debug to add a platform-specific value. Select the dropdown and change it to "Any iOS Simulator SDK". Then set its value to "disable" (Xcode 8) or "default" (Xcode 9) so it looks like this:

To turn off Verbose for OS Activity Mode, You simply go to (in Xcode Menu Bar)

• Product -> Scheme -> Edit Scheme-> Run (Left) -> Select Arguments -> On Environment Variables,

• add OS_ACTIVITY_MODE and value as disable