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omtb demo error

hi all

my board = evm8168 + vs daughter board

my ezsdk = ti-ezsdk_dm816x-evm_5_01_01_80

my rootfs = tar from the ti-ezsdk_dm816x-evm_5_01_01_80/filesystem/ezsdk-dm816x-evm-rootfs.tar.gz

omtb demo = targetfs/usr/share/ti/ti-omtb/omtb_dm816xbm_a8host.xv5T

demo script =   targetfs/usr/share/ti/ti-omtb/vs2_demo_usecase.oms

my bootargs = setenv bootargs 'console=ttyO2,115200n8 rootwait root=/dev/nfs nfsroot=10.9.1.76:/home/user/targetfs,nolock rw mem=256M earlyprink vram=50M ti816xfb.vram=0:16M,1:16M,2:6M ip=dhcp noinitrd'

after power on the board 

execute the cmd  [ ./omtb_dm816xbm_a8host.xv5T  vs2_demo_usecase.oms ]  to run the demo

after long wait  get the below error

#######################################

OMTB> omx api sendcommand state tvp 0 waitforsem
OMTB-In VPSSTVP_EventHandler: OMX_EventCmdComplete -  OMX_CommandStateSet
OMTB-OMX_StateIdle
OMTB-In <VPSSTVP_OmxSendCommandState>: Obtained completion event of state transition
OK
    
OMTB>
    
OMTB> omx api sendcommand state vfcc 0 idle
OMTB-OMX_ErrorNone
OMTB-FAIL: OMX_ErrorBadParameter
OMTB-Error in Buffer allocation for o/p port
OMTB-FAIL: OMX_ErrorBadParameter
OMTB-FAIL: OMX_ErrorBadParameter
    
OMTB> omx api sendcommand state vfcc 0 waitforsem

>>>>>why ?

how can i to do next ?

thank you for any help