"This endpoing is not longer available" error

[Sfinx]

Hi, while trying to check examples, getting this error

[Dao]:rus:~/apiai-cpp-client/build # ./examples/portaudio_example 
response_status_code: 200
download_size: 231
terminate called after throwing an instance of 'ai::ResponseErrorException'
  what():  This endpoing is not longer available.
Aborted

What can be the problem ?