error running qt Embedded application

["ilpaso@inwind.it" <ilpaso@inwind.it>]

Hi all,
I installed the emdebian distro on a tablet.
The rootfs is stored inside a sdcard

I crossCompiled Qt embedded for my device.
I'd like to run my qt application not on X11 but with direct Frame buffer.
The right command is ./application -qws.
When I run the application the system returns this error:
#################
Cannot create semaphore /tmp/qtembedded-0/QtEmbedded-0 'd'
Error 38 Function not implemented
Cannot get display lock
Aborted 
#################
I tried to change the /tmp permissions but the result is a "wrong permission" 
error.

I think it is a memory error.
Anyone can help me?

Thankyou
ilpaso