ncDeviceOpen error on my virtualbox env

[idata]

host os:

macOS Mojave 10.14guest os: * * NAME="Ubuntu" * * VERSION="16.04.5 LTS (Xenial Xerus)" * * ID=ubuntu * * ID_LIKE=debian * * PRETTY_NAME="Ubuntu 16.04.5 LTS" * * VERSION_ID="16.04"virtualbox ,with extension pack. 5.2.22 r126460 (Qt5.6.3) with :Oracle_VM_VirtualBox_Extension_Pack-5.2.22

usb setting:

broucelee@broucelee-VirtualBox:~/ncsdk$ lsusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 03e7:2485 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubbroucelee@broucelee-VirtualBox:/usr/bin$ usb-devices T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 8 D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1 P: Vendor=1d6b ProdID=0002 Rev=04.15 S: Manufacturer=Linux 4.15.0-39-generic xhci-hcd S: Product=xHCI Host Controller S: SerialNumber=0000:00:0c.0 C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=80ee ProdID=0021 Rev=01.00 S: Manufacturer=VirtualBox S: Product=USB Tablet C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 5 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=03e7 ProdID=2485 Rev=00.01 S: Manufacturer=Movidius Ltd. S: Product=Movidius MyriadX S: SerialNumber=03e72485 C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=11 Prot=ff Driver=(none) T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=5000 MxCh= 6 D: Ver= 3.00 Cls=09(hub ) Sub=00 Prot=03 MxPS= 9 #Cfgs= 1 P: Vendor=1d6b ProdID=0003 Rev=04.15 S: Manufacturer=Linux 4.15.0-39-generic xhci-hcd S: Product=xHCI Host Controller S: SerialNumber=0000:00:0c.0 C: #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub

ncsdk:

broucelee@broucelee-VirtualBox:~/ncsdk$ more version.txt 2.08.01.02

error:

`broucelee@broucelee-VirtualBox:~/ncsdk/examples/apps/hello_ncs_cpp/cpp$ ./hello_ncs_cpp W: [ 0] ncDeviceOpen:528 ncDeviceOpen() XLinkBootRemote returned error 3Error- ncDeviceOpen failed ncStatus value: -2 `

why?

help me please!thanks!