pause when start_vc using an independent sound card

[kaminosora]

C:\Programs\RVC1006Nvidia>runtime\python.exe gui_v1.py
is_half:True, device:cuda:0
Input device: 2:Loopback 1/2 (E1x2 OTG) (MME)
Output device: 11:Playback 5/6 (E1x2 OTG) (MME)
cuda_is_available: True
Audio block passed.
Index search FAILED or disabled
Loading rmvpe model
Audio block passed.
Audio block passed.

C:\Programs\RVC1006Nvidia>pause
请按任意键继续. . .

I used the Topping independent sound card and employed the Loopback and Playback as the input and output then started vc.
It seems that my GPU is working properly, but there's an issue with "Index search FAILED or disabled", and after several "Audio block passed", a pause occurred.
What caused this error to occur?