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RDK audio error when expending 4 chs to 16 chs

hi all

my hardware = ti8168evm + VS daughter card

my software = DVRRDK_01.08.00.15

first > i have modified files(demo & kernel) referring to DM814X_DVR_RDK_DemoGuide.pdf  

second > rebuild demo and kernel

third > errors occur when running the demo    below is the log

===================

 Audio Settings Menu

 ===================

 

 1: Set   Audio Storage Path

 2: Start Audio Capture

 3: Stop  Audio Capture

 4: Start Audio Playback

 5: Stop  Audio Playback

 

 p: Previous Menu

 

 Enter Choice: 1
 
 Enter file write path : /home
 
 Selected file write path [/home]
 
Store path set to /home
Trying to set storage path to /home


 ===================

 Audio Settings Menu

 ===================

 

 1: Set   Audio Storage Path

 2: Start Audio Capture

 3: Stop  Audio Capture

 4: Start Audio Playback

 5: Stop  Audio Playback

 p: Previous Menu

 Enter Choice: 2
 
 Select AUDIO CAPTURE CH ID [0 .. 15] : 0
 
 Selected CH ID = 0

 

Removing /home/01/record01.pcm
Removing /home/01/record02.pcm
Removing /home/01/record03.pcm
Removing /home/01/record04.pcm
Removing /home/01/record05.pcm
Removing /home/01/record06.pcm
Removing /home/01/record07.pcm
Removing /home/01/record08.pcm
Removing /home/01/record09.pcm
Removing /home/01/record10.pcm
 


 ===================

 Audio Settings Menu

 ===================

 

 1: Set   Audio Storage Path

 2: Start Audio Capture

 3: Stop  Audio Capture

 4: Start Audio Playback

 5: Stop  Audio Playback

 p: Previous Menu

 Enter Choice: Opened /home/01/record01.pcm for recording..
 AUDIO >>  CAPTURE ERROR Broken pipe, capture wont continue...

fourth> i have test in the DVRRDK_01.09.00.16 and DVRRDK_01.06.00.11

              the result is the same as DVRRDK_01.08.00.15

why ???????????????????????????????????????????

thank you for any help