MATLAB Problem

I have a problem to use MATLAB API & xem3010 board

I can see these msg if I use “ok_getdevicelist” function.

ok_getdevicelist

ans =

brdXEM3010

[And]

okpll22150
VCO: P=8 Q=2 Frequency=192 MHz
Divider 1: Src=DivSrc_VCO N=4
Divider 2: Src=DivSrc_VCO N=4
Output 1: Src=ClkSrc_Ref Frequency=48 MHz Enabled:no
Output 2: Src=ClkSrc_Ref Frequency=48 MHz Enabled:no
Output 3: Src=ClkSrc_Ref Frequency=48 MHz Enabled:no
Output 4: Src=ClkSrc_Ref Frequency=48 MHz Enabled:no
Output 5: Src=ClkSrc_Ref Frequency=48 MHz Enabled:no
Output 6: Src=ClkSrc_Ref Frequency=48 MHz Enabled:no

But when I use “okusbxem3010” function

okusbxem3010
XEM3010:
NO DEVICE OPEN.

Why cannot I find device?