There is a problem with the flashphoner library that enumerates the microphone devices. The problem seems to happen on desktop PCs that only have build in sound card and do not have attached a webcam.
As you can see from my screenshot even though the library cannot enumerate the devices I am able to get the list from console with the enumerateDevices()
As you can see from my screenshot even though the library cannot enumerate the devices I am able to get the list from console with the enumerateDevices()