如下，displayNode报错，status=-1，板子已接上显示屏，大概是什么原因导致这个报错呢
root@j7-evm:/opt/vision_apps# ./run_app_tidl.sh
APP: Init ... !!!
MEM: Init ... !!!
MEM: Initialized DMA HEAP (fd=4) !!!
MEM: Init ... Done !!!
IPC: Init ... !!!
IPC: Init ... Done !!!
REMOTE_SERVICE: Init ... !!!
REMOTE_SERVICE: Init ... Done !!!
2559794.387844 s: GTC Frequency = 200 MHz
APP: Init ... Done !!!
2559794.387889 s: VX_ZONE_INIT:Enabled
2559794.387897 s: VX_ZONE_ERROR:Enabled
2559794.387904 s: VX_ZONE_WARNING:Enabled
2559794.388338 s: VX_ZONE_INIT:[tivxInit:71] Initialization Done !!!
2559794.388523 s: VX_ZONE_INIT:[tivxHostInit:48] Initialization Done for HOST !!!
2559794.432028 s: VX_ZONE_ERROR:[ownContextSendCmd:785] Command ack message returned failure cmd_status: -1
2559794.432055 s: VX_ZONE_ERROR:[ownContextSendCmd:819] tivxEventWait() failed.
2559794.432065 s: VX_ZONE_ERROR:[ownNodeKernelInit:538] Target kernel, TIVX_CMD_NODE_CREATE failed for node DisplayNode
2559794.432074 s: VX_ZONE_ERROR:[ownNodeKernelInit:539] Please be sure the target callbacks have been registered for this core
2559794.432083 s: VX_ZONE_ERROR:[ownNodeKernelInit:540] If the target callbacks have been registered, please ensure no errors are occurring within the create callback of this kernel
2559794.432093 s: VX_ZONE_ERROR:[ownGraphNodeKernelInit:583] kernel init for node 0, kernel com.ti.hwa.display ... failed !!!
2559794.432102 s: VX_ZONE_ERROR:[vxVerifyGraph:2044] Node kernel init failed
2559794.432110 s: VX_ZONE_ERROR:[vxVerifyGraph:2098] Graph verify failed
app_tidl: ERROR: Verifying display graph ... Failed !!!
2559794.433124 s: VX_ZONE_INIT:[tivxHostDeInit:56] De-Initialization Done for HOST !!!
2559794.437445 s: VX_ZONE_INIT:[tivxDeInit:111] De-Initialization Done !!!
APP: Deinit ... !!!
REMOTE_SERVICE: Deinit ... !!!
REMOTE_SERVICE: Deinit ... Done !!!
IPC: Deinit ... !!!
IPC: DeInit ... Done !!!
MEM: Deinit ... !!!
MEM: Alloc's: 15 alloc's of 25494823 bytes
MEM: Free's : 15 free's of 25494823 bytes
MEM: Open's : 0 allocs of 0 bytes
MEM: Deinit ... Done !!!
APP: Deinit ... Done !!!
