Exception Running Example about gamenetworkingsockets HOT 4 CLOSED

Application Specific Information:
libGameNetworkingSockets.dylib
abort() called
terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument

Thread 0 Crashed:: tid_307  Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff5e783b66 __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff5e94e080 pthread_kill + 333
2   libsystem_c.dylib             	0x00007fff5e6df1ae abort + 127
3   libmonobdwgc-2.0.dylib        	0x000000013e5aa4b2 mono_handle_native_crash + 585
4   libsystem_platform.dylib      	0x00007fff5e941f5a _sigtramp + 26
5   com.unity3d.UnityEditor5.x    	0x0000000100020008 floor1_encode + 696
6   libsystem_c.dylib             	0x00007fff5e6df1ae abort + 127
7   libc++abi.dylib               	0x00007fff5c5d9f8f abort_message + 245
8   libc++abi.dylib               	0x00007fff5c5da113 default_terminate_handler() + 241
9   libobjc.A.dylib               	0x00007fff5da1beab _objc_terminate() + 105
10  libc++abi.dylib               	0x00007fff5c5f57c9 std::__terminate(void (*)()) + 8
11  libc++abi.dylib               	0x00007fff5c5f526f __cxa_throw + 121
12  libc++.1.dylib                	0x00007fff5c5c87af std::__1::__throw_system_error(int, char const*) + 77
13  libc++.1.dylib                	0x00007fff5c5bac93 std::__1::mutex::lock() + 29
14  libc++.1.dylib                	0x00007fff5c5bb118 std::__1::recursive_timed_mutex::lock() + 42
15  libGameNetworkingSockets.dylib	0x0000000120635a40 SteamNetworkingSocketsLib::SteamDatagramTransportLock::Lock() + 16 (steamnetworkingsockets_lowlevel.cpp:75)
16  libGameNetworkingSockets.dylib	0x0000000120626f95 SteamNetworkingSocketsLib::EnsureConfigValueTableInitted() + 53 (steamnetworkingsockets_lowlevel.h:354)
17  libGameNetworkingSockets.dylib	0x000000012062761f SteamNetworkingSocketsLib::CSteamNetworkingSockets::CSteamNetworkingSockets() + 447 (vector:1471)
18  libGameNetworkingSockets.dylib	0x000000012062cd48 _GLOBAL__sub_I_csteamnetworkingsockets.cpp + 2360 (csteamnetworkingsockets.cpp:1239)