Failed to create capture device

Hi all~
I want to input voice to my game from mic, so I need get a voice input function.
From here [link text][1]How can I make in game voice communication? - Audio - Epic Developer Community Forums , I know that I can use FVoiceModule::Get().CreateVoiceCapture() to get a capture and edit the DefaultEngine.txt.

[URL]

[Voice] 
bEnabled=true
 
[OnlineSubsystem] 
bHasVoiceEnabled=true

[/Script/HardwareTargeting.HardwareTargetingSettings]
TargetedHardwareClass=Desktop
AppliedTargetedHardwareClass=Desktop
DefaultGraphicsPerformance=Maximum
AppliedDefaultGraphicsPerformance=Maximum

why I still cannot use the capture to get voice? When I start my proj, there is a word as ‘Failed to create capture device 0x88780078’ which being printed on the OutLog page.

97802-20160709165324.png

who can help me? I’m fall in a big trouble.
Please ignore my pool English :stuck_out_tongue:

Finally, I found it’s a ez problem.
Solution is that just plug in your mic.