windows SDK cannot to join room

[alun_a_]

hi!
I got some exceptions while debugging the windows SDK samples,  the method called getToken() was fine, but cannot join room with method Join().

How should I fix it? Thanks very much!

The error messages are following  pictures:

Exception thrown at 0x7720DAE8 (ntdll.dll) in ConferenceSampleQt.exe: 0xC0000005: Access violation writing location 0x00000014.