[QDirectFBScreen: error creating DirectFB interface]: Out of video memory!

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when i running Qt embedded DirectFB on my device, error is:



=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2011.02.10 11:43:04 =~=~=~=~=~=~=~=~=~=~=~=
echo $QWS_DISPLAYOut of video memory!
tango3[browser]# ./browser -qws -keyboard -mouse &
956
tango3[browser]# (!) DirectFB/Config: Unable to open config file `/etc/directfbrc'!
(*) DirectFB/Config: Active DTV signal edid
(*) DirectFB/Config: Active DTV connector hdmi
(*) DirectFB/Config: Active Component standard hdtv60
(*) DirectFB/Config: Active Component signal 1080i
(*) DirectFB/Config: Active DTV connector ycrcb
(*) DirectFB/Config: Active Analog standard ntsc
(*) DirectFB/Config: Active Analog signal ntsc
(*) DirectFB/Config: Active Analog connector cvbs
(*) DirectFB/Config: Driver options file /tango3/dcchd_SMP8652_3_8_2_aqua.mips/sigmadfbrc
(!) DirectFB/Config: Unable to open config file `/root/.directfbrc'!
(!) DirectFB/Config: Unable to open config file `/etc/directfbrc.browser'!
(!) DirectFB/Confir: exclusive access only
ig: Unable to open config file `/root/.directfbrc.browser'!

=======================| DirectFB 1.0.0 |=======================
(c) 2001-2007 The DirectFB Organization (directfb.org)
(c) 2000-2004 Convergence (integrated media) GmbH
------------------------------------------------------------

(*) DirectFB/Core: Single Application Core. (2010-06-05)
SYSTEM:ERROR:RUA splash screen clean up error 9
(!) System initialised
(!) DirectFB/em86remote: IR device /dev/ir could not be opened, retry in 1 second
--> Input/output error
(*) Direct/Thread: Running 'EM86 Input' (INPUT, 957)...
(*) DirectFB/Input: EM86xx remote control 1.0 (SigmaDesigns)
(!) DirectFB/em86remote_tcp: could not bind server socket to port 30000 --> Address already in use
************************************************** **************************
* *
* WARNING WARNING WARNING *
* *
* DCCHD logging is disabled! *
* To enable it define ENABLE_DEV_SUPPORT in the environment. *
* *
************************************************** **************************
(!) Driver getting globals=0x4a8108
(!) DirectFB/Core: Could not initialize 'gfxcard' core!
--> Out of video memory!
(!) System is going down !!
(!) System is down!!
(#) DirectFBError [QDirectFBScreen: error creating DirectFB interface]: Out of video memory!
directfb: driver cannot connect


why ?